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Note 15 - Stock-based Compensation - Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock      
Outstanding, beginning (in shares) 46,389 39,438 45,046
Granted (in shares) 37,315 28,289 22,382
Released (in shares) (22,660)    
Forfeited (in shares)     (500)
Outstanding, ending (in shares) 64,099 46,389 39,438
Weighted average fair value per share granted (in dollars per share) $ 43.50 $ 44.44 $ 22.64
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Grant Date Fair Value $ 622 $ 509 $ 474
Restricted Stock Units (RSUs)      
Released (in shares) (14,655)    
Restricted Stock And Restricted Stock Units      
Released (in shares) (19,605) (21,338) (27,490)