Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock-based Compensation - Nonvested Option Awards Activity (Details)

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Note 6 - Stock-based Compensation - Nonvested Option Awards Activity (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Nonvested, shares (in shares) 380,000 235,000 18,500 23,500 235,000 23,500
Options granted, shares (in shares) 127,500 145,000 10,000 0 272,500 10,000
Vested, shares (in shares) (25,000) 0 (15,500) (5,000)    
Forfeited, shares (in shares) 0 0 0 0    
Nonvested, shares (in shares) 482,500 380,000 13,000 18,500 482,500 13,000
Nonvested, weighted average grant date fair value (in dollars per share) $ 0.94 $ 0.36 $ 0.15 $ 0.17 $ 0.36 $ 0.17
Granted, weighted average grant date fair value (in dollars per share) 1.19 1.22 0.08 0    
Vested, weighted average grant date fair value (in dollars per share) 1.01 0 0.16 0.21    
Forfeited, weighted average grant date fair value (in dollars per share) 0 0 0 0    
Nonvested, weighted average grant date fair value (in dollars per share) $ 0.94 $ 0.94 $ 0.09 $ 0.15 $ 0.94 $ 0.09