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Note 11 - Equity Plans - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Outstanding, number of shares (in shares) 576,867 610,540 610,540
Outstanding, weighted average estimated fair value (in dollars per share) $ 18.40 $ 18.25 $ 18.25
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 35,558 20,604  
Granted, weighted average estimated fair value (in dollars per share) $ 26.72 $ 23.29  
Converted into shares, number of shares (in shares) (3,580) (2,422)  
Converted into shares, weighted average estimated fair value (in dollars per share) $ 18.84 $ 17.09  
Forfeited, number of shares (in shares) (3,351) (5,086)  
Forfeited, weighted average estimated fair value (in dollars per share) $ 18.14 $ 17.55  
Outstanding, number of shares (in shares) 605,494 623,636 576,867
Outstanding, weighted average estimated fair value (in dollars per share) $ 18.89 $ 18.43 $ 18.40
Vested, number of shares (in shares) 409,710 414,090  
Vested, weighted average estimated fair value (in dollars per share) $ 20.17 $ 18.76