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 ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Outstanding, number of shares (in shares) 2,433,000  
Outstanding, weighted average exercise price per share (in dollars per share) $ 5.18  
Outstanding, Aggregate Intrinsic Value $ 4,000 $ 246,000
Granted, number of shares (in shares) 239,000  
Granted, weighted average exercise price per share (in dollars per share) $ 1.51  
Exercised, number of shares (in shares) 0  
Exercised, weighted average exercise price per share (in dollars per share) $ 0  
Canceled / forfeited, number of shares (in shares) (194,000)  
Canceled / forfeited, weighted average exercise price per share (in dollars per share) $ 4.23  
Outstanding, number of shares (in shares) 2,478,000  
Outstanding, weighted average exercise price per share (in dollars per share) $ 4.90  
Outstanding, Weighted Average Remaining Contractual Term (Year) 6 years 10 months 13 days  
Vested and exercisable, number of shares (in shares) 1,569,000  
Vested and exercisable, weighted average exercise price per share (in dollars per share) $ 5.80  
Vested and exercisable, Weighted Average Remaining Contractual Term (Year) 5 years 11 months 26 days  
Vested and exercisable, Aggregate Intrinsic Value $ 4,000