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Note 7 - Shareholders' Equity - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Unvested, number of shares (in shares) | shares 164,697
Unvested, weighted average award price (in dollars per share) | $ / shares $ 1.48
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares
Granted, weighted average award price (in dollars per share) | $ / shares
Vested, number of shares (in shares) | shares (54,899)
Vested, weighted average award price (in dollars per share) | $ / shares $ 1.48
Forfeited, number of shares (in shares) | shares
Forfeited, weighted average award price (in dollars per share) | $ / shares
Unvested, number of shares (in shares) | shares 109,798
Unvested, weighted average award price (in dollars per share) | $ / shares $ 1.48
Expected to vest, number of shares (in shares) | shares 107,223
Expected to vest, weighted average award price (in dollars per share) | $ / shares $ 1.48