Annual report pursuant to Section 13 and 15(d)

Note 4 - Stock-based Compensation - Summary of Unvested Restricted Stock (Details)

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Note 4 - Stock-based Compensation - Summary of Unvested Restricted Stock (Details) - Restricted Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Unvested at beginning of period (in shares) 60,000  
Unvested at beginning of period, weighted average grant-date fair value (in dollars per share) $ 2.90  
Granted (in shares) 105,000  
Granted, weighted average grant-date fair value (in dollars per share) $ 1.48  
Vested (in shares) (70,000) (15,000)
Vested, weighted average grant-date fair value (in dollars per share) $ 2.81  
Unvested at end of period (in shares) 95,000 60,000
Unvested at end of period, weighted average grant-date fair value (in dollars per share) $ 1.40 $ 2.90