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Note 8 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 28, 2021	Mar. 29, 2020	Sep. 27, 2020
Income Tax Expense (Benefit), Total	$ (571,000)	$ (2,331,000)	$ 5,740,000	$ (460,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total	$ (1,179,000)	$ (7,321,000)	$ 21,535,000	$ 268,000
Effective Income Tax Rate Reconciliation, Percent, Total	48.40%	31.80%	26.70%	(171.60%)
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total					$ 46,066,000

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