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Note 6 - Stock-based Compensation - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
shares
Outstanding, shares (in shares) | shares 365
Weighted average exercise price per share (in dollars per share) | $ / shares $ 30.00
Options outstanding, forfeited (in shares) | shares (16)
Weighted average exercise price per share, forfeited (in dollars per share) | $ / shares $ 32.98
Options outstanding, exercised (in shares) | shares (5)
Weighted average exercise price per share, exercised (in dollars per share) | $ / shares $ 19.86
Aggregate intrinsic value, exercised | $ $ 46
Outstanding, shares (in shares) | shares 344
Weighted average exercise price per share (in dollars per share) | $ / shares $ 30.00
Contractual term - weighted average, balance (Year) 7 years 1 month 28 days
Aggregate intrinsic value, outstanding | $ $ 899
Options outstanding, vested and anticipated to vest in future (in shares) | shares 338
Weighted average exercise price per share, vested and anticipated to vest in future (in dollars per share) | $ / shares $ 29.93
Contractual term - weighted average, vested and anticipated to vest in future (Year) 7 years 1 month 17 days
Aggregate intrinsic value, vested and anticipated to vest in future | $ $ 896
Options outstanding, exercisable (in shares) | shares 192
Weighted average exercise price per share, exercisable (in dollars per share) | $ / shares $ 28.51
Contractual term - weighted average, exercisable (Year) 5 years 11 months 26 days
Aggregate intrinsic value, exercisable | $ $ 674