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Note 5 - Stock-based Compensation; Changes in Equity - Option Activity (Details)
 9 Months Ended
Sep. 30, 2020
$ / shares
shares
Outstanding, beginning of period (in shares) | shares 471,144
Outstanding, beginning of period (in dollars per share) | $ / shares $ 3.95
Granted (in shares) | shares 792,660
Granted (in dollars per share) | $ / shares $ 1
Cancelled/Expired (in shares) | shares (436,519)
Cancelled/Expired (in dollars per share) | $ / shares $ 3.95
Exercised/Issued (in shares) | shares (347,483)
Exercised/Issued (in dollars per share) | $ / shares $ 1.19
Outstanding at the end of period (in shares) | shares 479,802
Outstanding at the end of period (in dollars per share) | $ / shares $ 1.10
Exercisable at the end of period (in shares) | shares 19,625
Exercisable at the end of period (in dollars per share) | $ / shares $ 5.49