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Note 16 - Stock-Based Compensation - Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Stock      
Outstanding, beginning (in shares) 102,489 106,826 64,099
Granted (in shares) 12,412 8,913 18,634
Released (in shares) (43,691) (37,296) (37,624)
Forfeited (in shares) (51) (1,600) (5,610)
Outstanding, ending (in shares) 97,107 102,489 106,826
Weighted average fair value per share granted (in dollars per share) $ 45.18 $ 39.39 $ 20.14
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Grant Date Fair Value $ 1.9 $ 1.4 $ 1.3
Restricted Stock Units (RSUs)      
Granted (in shares) 25,948 25,646 49,269
Performance Shares [Member]      
Granted (in shares)     18,058
Restricted Stock And Restricted Stock Units      
Granted (in shares) 38,360 34,559 85,961