Note 9 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Mar. 29, 2020	Mar. 31, 2019	Sep. 29, 2019
Income Tax Expense (Benefit), Total	$ (2,331,000)	$ 156,000	$ (460,000)	$ 4,670,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total	$ 7,321,000	$ 2,171,000	$ 268,000	$ 13,062,000
Effective Income Tax Rate Reconciliation, Percent, Total	31.80%	(7.20%)	(171.60%)	35.80%
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total					$ 63,048,000