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Note 16 - Stock-Based Compensation - Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock      
Outstanding, beginning (in shares) 106,826 64,099 46,389
Granted (in shares) 8,913 18,634 22,660
Forfeited (in shares) (1,600) (5,610)  
Outstanding, ending (in shares) 102,489 106,826 64,099
Weighted average fair value per share granted (in dollars per share) $ 39.39 $ 20.14 $ 43.50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Grant Date Fair Value $ 1,400 $ 1,300 $ 622
Restricted Stock Units (RSUs)      
Granted (in shares) 25,646 49,269 14,655
Performance Shares [Member]      
Granted (in shares)   18,058  
Restricted Stock And Restricted Stock Units      
Granted (in shares) 34,559 85,961 37,315
Released (in shares) (37,296) (37,624) (19,605)