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Note 8 - Incentive Plans - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Outstanding (in shares) 224,750 187,750
Outstanding, weighted average exercise price (in dollars per share) $ 3.44 $ 3.70
Granted (in shares) 186,200 134,000
Granted, weighted average exercise price (in dollars per share) $ 4.31 $ 3.36
Exercised (in shares) (2,250) 0
Exercised, weighted average exercise price (in dollars per share) $ 3.20
Cancelled (in shares) (36,500) (97,000)
Cancelled, weighted average exercise price (in dollars per share) $ (3.66) $ (3.84)
Outstanding, weighted average remaining contractual term (Year) 8 years 208 days 8 years 219 days
Outstanding, aggregate intrinsic value $ 379,429 $ 52,715
Exercised, weighted average exercise price (in dollars per share) $ (3.20)
Outstanding (in shares) 372,200 224,750
Outstanding, weighted average exercise price (in dollars per share) $ 3.85 $ 3.44
Exercisable (in shares) 107,567  
Exercisable, weighted average exercise price (in dollars per share) $ 3.44  
Exercisable, weighted average remaining contractual term (Year) 7 years 251 days  
Exercisable, aggregate intrinsic value $ 154,305