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Note 12 - Employee Benefit Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Options outstanding at beginning of period (in shares) 114,279    
Options outstanding at beginning of period (in dollars per share) $ 19.56    
Granted (in shares) 131,198 0  
Granted (in dollars per share) $ 33.00    
Exercised (in shares) (39,995) 0 (8,459)
Exercised (in dollars per share) $ 13.44    
Canceled/Expired (in shares) (604)    
Canceled/Expired (in dollars per share) $ 24.72    
Options outstanding at end of period (in shares) 204,878 114,279  
Options outstanding at end of period (in dollars per share) $ 29.35 $ 19.56  
Options outstanding at end of period (Year) 4 years 11 months 26 days    
Options outstanding at end of period $ 834    
Options exercisable at end of period (in shares) 73,680    
Options exercisable at end of period (in dollars per share) $ 22.84    
Options exercisable at end of period (Year) 5 years 5 months 1 day    
Options exercisable at end of period $ 779