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Note 9 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Sep. 29, 2019
Income Tax Expense (Benefit), Total	$ 368,000	$ 1,505,000	$ (92,000)	$ 6,175,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total	$ (359,000)	$ 7,677,000	$ (90,000)	$ 20,739,000
Effective Income Tax Rate Reconciliation, Percent, Total	(102.50%)	19.60%	(102.20%)	29.80%
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total					$ 63,338,000

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