Note 4 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 29, 2018	Sep. 29, 2018
Cash equivalents	$ 16,565	$ 44,257
Cash surrender value of life insurance policies	9,238	9,769
Total	25,803	54,026
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	16,565	44,257
Total	16,565	44,257
Fair Value, Inputs, Level 2 [Member]
Cash surrender value of life insurance policies	9,238	9,769
Total	$ 9,238	$ 9,769

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant