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Note 6 - Stock-based Compensation - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Options outstanding, beginning balance (in shares) | shares 392
Weighted average exercise price per share, beginning balance (in dollars per share) $ 23.40
Options outstanding, granted (in shares) | shares 44
Exercise price per share, granted (in dollars per share) $ 29.69
Options outstanding, exercised (in shares) | shares (7)
Exercise price per share, exercised (in dollars per share) $ 21
Options outstanding, forfeited (in shares) | shares (9)
Exercise price per share, forfeited (in dollars per share) $ 29.88
Options outstanding, ending balance (in shares) | shares 420
Weighted average exercise price per share, ending balance (in dollars per share) $ 23.97
Contractual term - weighted average, ending balance (Year) 7 years 142 days
Aggregate intrinsic value, ending balance | $ $ 2,229
Options outstanding, vested and anticipated to vest in future (in shares) | shares 418
Weighted average exercise price per share, vested and anticipated to vest in future (in dollars per share) $ 23.94
Contractual term - weighted average, vested and anticipated to vest in future (Year) 7 years 138 days
Aggregate intrinsic value, vested and anticipated to vest in future | $ $ 2,223
Options outstanding, exercisable (in shares) | shares 236
Weighted average exercise price per share, exercisable (in dollars per share) $ 20.46
Contractual term - weighted average, exercisable (Year) 6 years 80 days
Aggregate intrinsic value, exercisable | $ $ 1,894
Minimum [Member]  
Exercise price per share, beginning balance (in dollars per share) $ 9.16
Exercise price per share, granted (in dollars per share) 29.69
Exercise price per share, exercised (in dollars per share) 18.05
Exercise price per share, forfeited (in dollars per share) 23.95
Maximum [Member]  
Exercise price per share, ending balance (in dollars per share) 37.06
Exercise price per share, granted (in dollars per share) 29.69
Exercise price per share, exercised (in dollars per share) 23.95
Exercise price per share, forfeited (in dollars per share) $ 37.06