| Schedule of assets and profit/loss of the segments | 
 
		
			
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						Three Months Ended 
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						Three Months Ended 
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				 | 
				
					 
						Nine Months Ended 
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				 | 
				
					 
						Nine Months Ended 
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				| 
					 
						  
				 | 
				
					 
						September 30, 
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				 | 
				
					 
						September 30, 
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				 | 
				
					 
						September 30, 
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				 | 
				
					 
						September 30, 
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				| 
					 
						  
				 | 
				
					 
						  
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						2018 
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						2017 
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						2018 
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				 | 
				
					 
						  
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						2017 
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				| 
					 
						Net sales 
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				 | 
				
					 
						  
				 | 
				
					 
						  
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				| 
					 
						Work Truck Attachments 
				 | 
				
					 
						$ 
				 | 
				
93,532
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
98,002
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
268,285
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
247,088
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Solutions 
				 | 
				
					 
						  
				 | 
				
34,704
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
32,243
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
110,563
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
96,767
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Corporate & Eliminations 
				 | 
				
					 
						  
				 | 
				
					 
						 (3,404) 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
(4,906)
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						 (6,606) 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						 (6,897) 
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						  
				 | 
				
					 
						$ 
				 | 
				
124,832
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
125,339
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
372,242
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
336,958
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Selling, general, and administrative expense 
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				 | 
				
					 
						  
				 | 
				
					 
						  
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				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Attachments 
				 | 
				
					 
						$ 
				 | 
				
9,219
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
7,378
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
24,549
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
22,780
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Solutions 
				 | 
				
					 
						  
				 | 
				
5,113
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
2,997
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
15,927
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
11,309
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Corporate & Eliminations 
				 | 
				
					 
						  
				 | 
				
2,260
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
2,539
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
12,805
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						 10,448 
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						  
				 | 
				
					 
						$ 
				 | 
				
16,592
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
12,914
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
53,281
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
44,537
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Income (loss) from operations 
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				 | 
				
					 
						  
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				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Attachments 
				 | 
				
					 
						$ 
				 | 
				
18,456
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
23,105
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
61,339
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
52,186
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Solutions 
				 | 
				
					 
						  
				 | 
				
135
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						 1,784 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						 1,988 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						 5,143 
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Corporate & Eliminations 
				 | 
				
					 
						  
				 | 
				
					 
						 (3,131) 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						 (4,745) 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						 (14,417) 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						 (12,123) 
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				 | 
			 
			
				| 
					 
						  
				 | 
				
					 
						$ 
				 | 
				
					 
						 15,460 
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
20,144
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
					 
						 48,910 
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
45,206
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Depreciation Expense 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Attachments 
				 | 
				
					 
						$ 
				 | 
				
1,467
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
1,366
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
4,244
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
4,085
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Solutions 
				 | 
				
					 
						  
				 | 
				
416
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
408
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
1,283
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
1,086
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Corporate & Eliminations 
				 | 
				
					 
						  
				 | 
				
33
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
32
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
83
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
112
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						  
				 | 
				
					 
						$ 
				 | 
				
1,916
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
1,806
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
5,610
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
5,283
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Assets 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Attachments 
				 | 
				
					 
						$ 
				 | 
				
482,371
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
471,163
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Solutions 
				 | 
				
					 
						  
				 | 
				
220,088
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
215,669
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Corporate & Eliminations 
				 | 
				
					 
						  
				 | 
				
10,281
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
7,238
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						  
				 | 
				
					 
						$ 
				 | 
				
712,740
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
694,070
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Capital Expenditures 
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Attachments 
				 | 
				
					 
						$ 
				 | 
				
1,726
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
1,470
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
4,609
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
3,560
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						Work Truck Solutions 
				 | 
				
					 
						  
				 | 
				
497
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
600
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
1,693
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
1,656
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						  
				 | 
				
					 
						$ 
				 | 
				
2,223
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
2,070
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
6,302
				 | 
				
					 
						  
				 | 
				
					 
						$ 
				 | 
				
5,216
				 | 
				
					 
						  
				 | 
			 
			
				| 
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
				
					 
						  
				 | 
			 
		  
		
			 
		 
   
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