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Note 9 - Incentive Plans - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended 24 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Outstanding (in shares) 372,200 224,750 224,750
Outstanding, weighted average exercise price (in dollars per share) $ 3.85 $ 3.44 $ 3.44
Granted (in shares) 42,300 186,200  
Granted, weighted average exercise price (in dollars per share) $ 4.34 $ 4.31  
Exercised (in shares) (14,133) (2,250)  
Exercised, weighted average exercise price (in dollars per share) $ (3.78)   $ (3.20)
Cancelled (in shares) (37,727) (36,500)  
Cancelled, weighted average exercise price (in dollars per share) $ (3.37) $ (3.66)  
Outstanding, weighted average remaining contractual term (Year) 7 years 284 days 8 years 208 days  
Outstanding, aggregate intrinsic value $ 1,164 $ 379 $ 1,164
Outstanding (in shares) 362,640 372,200 362,640
Outstanding, weighted average exercise price (in dollars per share) $ 3.96 $ 3.85 $ 3.96
Exercisable (in shares) 150,840   150,840
Exercisable, weighted average exercise price (in dollars per share) $ 3.61   $ 3.61
Exercisable, weighted average remaining contractual term (Year) 7 years 32 days    
Exercisable, aggregate intrinsic value $ 537   $ 537