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Note 7 - Stockholders' Equity - Options Outstanding by Exercise Price (Details)
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Options outstanding (in shares) | shares 25,000
Options outstanding, weighted average remaining contractual life (Year) 1 month 13 days
Options outstanding, weighted average exercise price (in dollars per share) $ 2.96
Options exercisable (in shares) | shares 25,000
Options exercisable, weighted average exercise price (in dollars per share) $ 2.96
Price Range 1 [Member]  
Exercise prices of options (in dollars per share) $ 2.96
Options outstanding (in shares) | shares 25,000
Options outstanding, weighted average remaining contractual life (Year) 1 month 13 days
Options outstanding, weighted average exercise price (in dollars per share) $ 2.96
Options exercisable (in shares) | shares 25,000
Options exercisable, weighted average exercise price (in dollars per share) $ 2.96