Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Note 6 - Stock-based Compensation - Nonvested Option Awards Activity (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Nonvested, shares (in shares) 482,500 380,000 235,000 13,000 18,500 23,500 235,000 23,500
Nonvested, weighted average grant date fair value (in dollars per share) $ 0.81 $ 0.94 $ 0.36 $ 0.09 $ 0.15 $ 0.17 $ 0.36 $ 0.17
Options granted, shares (in shares) 30,000 127,500 145,000 210,000 10,000 0 302,500 220,000
Granted, weighted average grant date fair value (in dollars per share) $ 1.15 $ 1.19 $ 1.22 $ 0.37 $ 0.08 $ 0    
Vested, shares (in shares) (215,000) (25,000) 0 (1,500) (15,500) (5,000)    
Vested, weighted average grant date fair value (in dollars per share) $ 0.41 $ 1.01 $ 0 $ 0.12 $ 0.16 $ 0.21    
Forfeited, shares (in shares) 0 0 0 0 0 0    
Forfeited, weighted average grant date fair value (in dollars per share) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0    
Nonvested, shares (in shares) 297,500 482,500 380,000 221,500 13,000 18,500 297,500 221,500
Nonvested, weighted average grant date fair value (in dollars per share) $ 1.13 $ 0.81 $ 0.94 $ 0.36 $ 0.09 $ 0.15 $ 1.13 $ 0.36