Note 12 - Other Financial Data - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Sep. 30, 2017
Accounts receivable, net:
Accounts receivable	$ 39,965	$ 40,485
Less allowance for doubtful accounts	(196)	(201)
Total	39,769	40,284
Inventories:
Raw materials	39,917	51,808
Work in process	3,169	2,637
Finished goods	27,832	27,408
Total	70,918	81,853
Other current assets:
Prepaid insurance	2,707	3,796
Income tax receivable	1,034	925
Other	1,360	1,228
Total	5,101	5,949
Other assets:
Cash surrender value of life insurance policies	9,435	9,026
Capitalized financing costs, net	89	105
Other	174	203
Total	9,698	9,334
Property, plant and equipment, net:
Land and land improvements	14,281	12,177
Buildings	53,390	50,373
Machinery and equipment	155,589	153,484
Construction in progress	5,144	5,641
Property, plant and equipment, gross	228,404	221,675
Less accumulated depreciation	(125,513)	(123,005)
Total	102,891	98,670
Accrued expenses:
Salaries, wages and related expenses	1,917	5,520
Customer rebates	1,450	1,015
Property taxes	1,360	1,384
Workers' compensation	115	116
Other	569	632
Total	5,411	8,667
Other liabilities:
Deferred compensation	9,403	9,276
Deferred Tax Liabilities, Net, Noncurrent	6,034	8,103
Other	1,078
Total	$ 16,515	$ 17,379