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Note 5 - Stock-based Compensation; Changes in Equity - Option Activity (Details)
 3 Months Ended
Mar. 31, 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 612,660
Granted (in dollars per share) | $ / shares $ 1
Cancelled/Expired (in shares) | shares 432,519
Cancelled/Expired (in dollars per share) | $ / shares
Exercised/Issued (in shares) | shares 15,000
Exercised/Issued (in dollars per share) | $ / shares $ 5.48
Outstanding at the end of period (in shares) | shares 636,285
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 $ 5.48