Quarterly report pursuant to Section 13 or 15(d)

Note 13 - Employee Stock Plans (Details Textual)

v3.22.2.2
Note 13 - Employee Stock Plans (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
May 31, 2010
Share-Based Payment Arrangement, Expense $ 510 $ 5 $ 5,563 $ 6,025  
Restricted Stock Units (RSUs) [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)     $ 36.72    
The 2010 Stock Incentive Plan [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)         2,130,000
The 2010 Stock Incentive Plan [Member] | Equity Awards [Member]          
Share-Based Payment Arrangement, Expense     $ 3,724 618  
The 2010 Stock Incentive Plan [Member] | Performance Shares [Member]          
Share-Based Payment Arrangement, Expense 234 290 $ 2,945 2,984  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)     $ 37,570    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total 2,293   $ 2,293    
The 2010 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]          
Share-Based Payment Arrangement, Expense 276 $ 295 2,618 $ 3,041  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,707   $ 1,707