Quarterly report pursuant to Section 13 or 15(d)

Note 13 - Employee Stock Plans - Summary of RSU Activity (Details)

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Note 13 - Employee Stock Plans - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Unvested, shares (in shares) 79,903  
Unvested, weighted average grant date fair value (in dollars per share) $ 48.87  
Unvested, contractual term (Year) 2 years 2 months 12 days 1 year 10 months 28 days
Granted, shares (in shares) 113,047  
Granted, weighted average grant date fair value (in dollars per share) $ 36.78  
Granted, contractual term (Year) 1 year 6 months 10 days  
Vested, shares (in shares) (77,535)  
Vested, weighted average grant date fair value (in dollars per share) $ 40.97  
Cancelled and forfeited, shares (in shares) (5,770)  
Cancelled and forfeited, weighted average grant date fair value (in dollars per share) $ 48.62  
Unvested, shares (in shares) 109,645 79,903
Unvested, weighted average grant date fair value (in dollars per share) $ 42.00 $ 48.87
Expected to vest in the future, shares (in shares) 107,070  
Expected to vest in the future, weighted average grant date fair value (in dollars per share) $ 42.00  
Expected to vest in the future, contractual term (Year) 2 years 2 months 12 days