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Note 9 - Share-based Compensation - Summary of Non-vested RSUs (Details) - Restricted Stock Units (RSUs) [Member]
 12 Months Ended
Dec. 31, 2023
$ / shares
shares
Balance, shares (in shares) 21,526
Balance, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 4.33
RSUs granted, shares (in shares) 331,552
RSUs granted, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 1.7
RSUs released, shares (in shares) (241,197)
RSUs released, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 1.93
RSUs forfeited, shares (in shares) (111,881)
RSUs forfeited, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 1.7
Balance, shares (in shares) 0