Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation - Nonvested Option Awards Activity (Details)

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Note 4 - Stock-based Compensation - Nonvested Option Awards Activity (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Nonvested, Shares, Balance (in shares) 29,000 41,000 148,500   148,500  
Nonvested, weighted average grant date fair value (in dollars per share) $ 0.16 $ 0.17 $ 0.20   $ 0.20  
Granted, shares (in shares) 0 3,000 3,000 3,000 163,000
Granted, weighted average grant date fair value (in dollars per share) $ 0.11   $ 0.11  
Vested, shares (in shares) (1,500) (12,500) (107,500)      
Vested, weighted average grant date fair value (in dollars per share) $ 0.12 $ 0.17 $ 0.21      
Forfeited, shares (in shares) (2,500)      
Forfeited, weighted average grant date fair value (in dollars per share) $ 0.21      
Nonvested, shares (in shares) 27,500 29,000 41,000   27,500  
Nonvested, weighted average grant date fair value (in dollars per share) $ 0.16 $ 0.16 $ 0.17   $ 0.16