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Note 10 - Share-based Compensation - Restricted Stock Units Activity (Details) - The 2014 Plan [Member]
9 Months Ended
Sep. 30, 2023
$ / shares
shares
Time-based Restricted Stock Units [Member]  
Outstanding non-vested (in shares) | shares 274,939
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 3.59
Granted (in shares) | shares 288,893
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 13
Vested (in shares) | shares (168,769)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 2.11
Forfeited or expired (in shares) | shares (11,102)
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares $ 2.23
Outstanding non-vested (in shares) | shares 383,961
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 11.36
Performance-based Restricted Stock Units [Member]  
Outstanding non-vested (in shares) | shares 225,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 8.73
Granted (in shares) | shares 0
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Vested (in shares) | shares (125,000)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 6.15
Forfeited or expired (in shares) | shares 0
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Outstanding non-vested (in shares) | shares 100,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 11.96