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Note 14 - Stock Compensation Plans - Summary of Nonvested Restricted Stock Awards (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Granted, weighted average grant date fair value (in dollars per share) $ 24.48 $ 31.10
Restricted Stock [Member]    
Nonvested (in shares) 44,450  
Nonvested, weighted average grant date fair value (in dollars per share) $ 31.11  
Granted (in shares) 16,000  
Granted, weighted average grant date fair value (in dollars per share) $ 24.48  
Vested (in shares) (12,500)  
Vested, weighted average grant date fair value (in dollars per share) $ 31.37  
Forfeited (in shares)  
Forfeited, weighted average grant date fair value (in dollars per share)  
Nonvested (in shares) 47,950 44,450
Nonvested, weighted average grant date fair value (in dollars per share) $ 28.83 $ 31.11