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Note 16 - Shareholders' Equity and Stock Plans - Unvested Restricted Shares (Details) - Restricted Stock [Member] - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unvested restricted shares outstanding (in shares) 66,768 74,489  
Unvested restricted shares weighted average grant price (in dollars per share) $ 10.50 $ 8.60  
Unvested restricted shares aggregate intrinsic value $ 1,000,954 $ 700,820 $ 640,255
Unvested restricted shares remaining contractual term (Year) 1 year 43 days 354 days 1 year 10 days
Granted (in shares) 57,292 29,913  
Restricted stock awards weighted average grant date fair value per share (in dollars per share) $ 11.02 $ 11.50  
Granted aggregate intrinsic value $ 631,336 $ 344,000  
Granted remaining contractual term (Year) 1 year 116 days 1 year 25 days  
Vested (in shares) (27,243) (37,634)  
Vested weighted average grant price (in dollars per share) $ 11.14 $ 7.53  
Vested aggregate intrinsic value $ 303,593 $ 283,433  
Forfeited (in shares) (5,096)    
Forfeited weighted average grant price (in dollars per share) $ 11.12    
Forfeited aggregate intrinsic value $ 56,659    
Unvested restricted shares outstanding (in shares) 91,721 66,768 74,489
Unvested restricted shares weighted average grant price (in dollars per share) $ 10.91 $ 10.50 $ 8.60