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Note 9 - Shareholders' Equity - Restricted Stock Activity (Details) - Restricted Stock [Member]
 9 Months Ended
Sep. 30, 2023
$ / shares
shares
Non-vested restricted stock (in shares) | shares 687,000
Non-vested restricted stock, weighted average grant date fair value (in dollars per share) | $ / shares $ 3.79
Granted (in shares) | shares 936,434
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 2.18
Vested (in shares) | shares (544,198)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 3.3
Modifications (accelerated vesting) (in shares) | shares (164,000)
Modifications (accelerated vesting), weighted average grant date fair value (in dollars per share) | $ / shares $ 2.85
Forfeited (in shares) | shares (60,000)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares $ 2.3
Non-vested restricted stock (in shares) | shares 855,236
Non-vested restricted stock, weighted average grant date fair value (in dollars per share) | $ / shares $ 2.63