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Note 13 - Employee Benefit Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Options outstanding at beginning of period (in shares) 156,255  
Options outstanding at beginning of period (in dollars per share) $ 20.85  
Granted (in shares) 0 0
Granted (in dollars per share)  
Exercised (in shares) (8,459)  
Exercised (in dollars per share) $ 16.14  
Canceled (in shares) (596)  
Canceled (in dollars per share) $ 24.72  
Options outstanding at end of period (in shares) 147,200 156,255
Options outstanding at end of period (in dollars per share) $ 21.10 $ 20.85
Options outstanding at end of period (Year) 4 years 219 days  
Options outstanding at end of period $ 1,460  
Options exercisable at end of period (in shares) 126,699  
Options exercisable at end of period (in dollars per share) $ 20.52  
Options exercisable at end of period (Year) 4 years 73 days  
Options exercisable at end of period $ 1,331