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Note 7 - Shareholders' Equity - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Unvested, number of shares (in shares) | shares 112,846
Unvested, weighted average award price (in dollars per share) | $ / shares $ 1.44
Granted, number of shares (in shares) | shares
Granted, weighted average award price (in dollars per share) | $ / shares
Vested, number of shares (in shares) | shares (112,846)
Vested, weighted average award price (in dollars per share) | $ / shares $ 1.44
Forfeited, number of shares (in shares) | shares
Forfeited, weighted average award price (in dollars per share) | $ / shares
Unvested, number of shares (in shares) | shares
Unvested, weighted average award price (in dollars per share) | $ / shares
Expected to vest, number of shares (in shares) | shares
Expected to vest, weighted average award price (in dollars per share) | $ / shares