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Note 10 - Incentive Plans - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Outstanding (in shares) 362,640 372,200
Outstanding, weighted average exercise price (in dollars per share) $ 3.96 $ 3.85
Granted (in shares) 49,000 42,300
Granted, weighted average exercise price (in dollars per share) $ 8.50 $ 4.34
Exercised (in shares) (13,400) (14,133)
Exercised, weighted average exercise price (in dollars per share) $ 3.43 $ 3.78
Cancelled (in shares) (10,740) (37,727)
Cancelled, weighted average exercise price (in dollars per share) $ 3.42 $ 3.37
Outstanding, weighted average remaining contractual term (Year) 7 years 2 months 1 day 7 years 9 months 10 days
Outstanding, aggregate intrinsic value $ 2,250 $ 1,164
Outstanding (in shares) 387,500 362,640
Outstanding, weighted average exercise price (in dollars per share) $ 4.57 $ 3.96
Exercisable (in shares) 186,700  
Exercisable, weighted average exercise price (in dollars per share) $ 3.79  
Exercisable, weighted average remaining contractual term (Year) 6 years 3 months 21 days  
Exercisable, aggregate intrinsic value $ 1,225