Note 7 - Stock-based Compensation - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 02, 2021 USD ($) $ / shares shares
Options outstanding, balance (in shares) | shares	482
Weighted average exercise price per share (in dollars per share)	$ 24.90
Options outstanding, exercised (in shares) | shares	(22)
Weighted average exercise price per share, exercised (in dollars per share)	$ 17.11
Options outstanding, balance (in shares) | shares	460
Weighted average exercise price per share (in dollars per share)	$ 25.28
Contractual term - weighted average, balance (Year)	6 years 6 months 10 days
Aggregate intrinsic value, balance | $	$ 589
Options outstanding, vested and anticipated to vest in future (in shares) | shares	454
Weighted average exercise price per share, vested and anticipated to vest in futur (in dollars per share)	$ 25.33
Contractual term - weighted average, vested and anticipated to vest in future (Year)	6 years 6 months
Aggregate intrinsic value, vested and anticipated to vest in future | $	$ 578
Options outstanding, exercisable (in shares) | shares	261
Weighted average exercise price per share, exercisable (in dollars per share)	$ 27.84
Contractual term - weighted average, exercisable (Year)	4 years 9 months 7 days
Aggregate intrinsic value, exercisable | $	$ 274
Minimum [Member]
Exercise price per share, balance, lower (in dollars per share)	$ 10.23
Exercise price per share, exercised, lower (in dollars per share)	13.06
Maximum [Member]
Exercise price per share, balance, upper (in dollars per share)	41.85
Exercise price per share, exercised, upper (in dollars per share)	$ 18.25