Annual report pursuant to Section 13 and 15(d)

Note 8 - Stock-based Incentive Plans - Stock Option Activity (Details)

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Note 8 - Stock-based Incentive Plans - Stock Option Activity (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 29, 2020
Dec. 31, 2021
Dec. 31, 2020
Outstanding, number of shares (in shares)   1,638,000  
Outstanding, weighted average exercise price per share (in dollars per share)   $ 5.59  
Outstanding, Aggregate Intrinsic Value   $ 246,000 $ 308,000
Granted, number of shares (in shares)   998,000  
Granted, weighted average exercise price per share (in dollars per share)   $ 4.50  
Exercised, number of shares (in shares)   (35,000)  
Exercised, weighted average exercise price per share (in dollars per share)   $ 3.17  
Canceled / forfeited, number of shares (in shares) (540,000) (168,000)  
Canceled / forfeited, weighted average exercise price per share (in dollars per share) $ 10.16 $ 5.63  
Outstanding, number of shares (in shares)   2,433,000  
Outstanding, weighted average exercise price per share (in dollars per share)   $ 5.18  
Outstanding, Weighted Average Remaining Contractual Term (Year)   7 years 8 months 23 days  
Vested and exercisable, number of shares (in shares)   1,004,000  
Vested and exercisable, weighted average exercise price per share (in dollars per share)   $ 6.66  
Vested and exercisable, Weighted Average Remaining Contractual Term (Year)   5 years 9 months 25 days  
Vested and exercisable, Aggregate Intrinsic Value   $ 242,000