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Note 16 - Stock-Based Compensation - Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock      
Outstanding, beginning (in shares) 64,099 46,389 39,438
Granted (in shares) 18,634 22,660 28,289
Forfeited (in shares) (5,610)    
Outstanding, ending (in shares) 106,826 64,099 46,389
Weighted average fair value per share granted (in dollars per share) $ 20.14 $ 43.50 $ 44.44
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Grant Date Fair Value $ 1,300 $ 622 $ 509
Restricted Stock Units (RSUs)      
Granted (in shares) 49,269 14,655  
Performance Shares [Member]      
Granted (in shares) 18,058    
Restricted Stock And Restricted Stock Units      
Granted (in shares) 85,961 37,315 28,289
Released (in shares) (37,624) (19,605) (21,338)