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Note 7 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 24, 2018	Jun. 30, 2019	Jun. 24, 2018	Sep. 30, 2018
Income Tax Expense (Benefit), Total	$ 1,505,000	$ 1,972,000	$ 6,175,000	$ (16,791,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total	$ (7,677,000)	$ 6,722,000	$ 20,739,000	$ 25,820,000
Effective Income Tax Rate Reconciliation, Percent, Total	19.60%	29.30%	29.80%	(65.00%)
Operating Loss Carryforwards, Total					$ 63,048,000

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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