Note 10 - Stock Ownership Plans - Summary of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Mar. 28, 2021 USD ($) $ / shares shares
Outstanding, Shares (in shares) | shares	41
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 11.40
Exercised, Shares (in shares) | shares	0
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 0
Cancelled, Shares (in shares) | shares	0
Cancelled, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 0
Outstanding, Shares (in shares) | shares	41
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 11.40
Outstanding, Weighted Average Remaining Contractual Term (Year)	1 year 2 months 4 days
Outstanding, Aggregate Intrinsic Value | $	$ 590
Exercisable, Shares (in shares) | shares	41
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 11.40
Exercisable, Weighted Average Remaining Contractual Term (Year)	1 year 2 months 4 days
Exercisable, Aggregate Intrinsic Value | $	$ 590