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Note 6 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 29, 2018
Sep. 29, 2018
Options outstanding, balance (in shares) 264  
Weighted average exercise price per share, beginning balance (in dollars per share) $ 29.25  
Options outstanding, exercised (in shares) (5)  
Weighted average exercise price per share, exercised (in dollars per share) $ 23.95  
Options outstanding, balance (in shares) 259 264
Weighted average exercise price per share, ending balance (in dollars per share) $ 29.36 $ 29.25
Contractual term - weighted average, balance (Year) 7 years 222 days  
Aggregate intrinsic value, balance $ 362  
Options outstanding, vested and anticipated to vest in future (in shares) 257  
Weighted average exercise price per share, vested and anticipated to vest in future (in dollars per share) $ 29.33  
Contractual term - weighted average, vested and anticipated to vest in future (Year) 7 years 219 days  
Aggregate intrinsic value, vested and anticipated to vest in future $ 362  
Options outstanding, exercisable (in shares) 103  
Weighted average exercise price per share, exercisable (in dollars per share) $ 24.77  
Contractual term - weighted average, exercisable (Year) 6 years 14 days  
Aggregate intrinsic value, exercisable $ 361  
Minimum [Member]    
Exercise price per share, balance, lower (in dollars per share) $ 10.23 10.23
Exercise price per share, exercised, lower (in dollars per share) 18.05  
Maximum [Member]    
Exercise price per share, balance, upper (in dollars per share) 41.85 $ 41.85
Exercise price per share, exercised, upper (in dollars per share) $ 26.75