Note 6 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 28, 2019	Sep. 29, 2018
Cash equivalents	$ 37,826	$ 44,257
Cash surrender value of life insurance policies	10,211	9,769
Total	48,037	54,026
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	37,826	44,257
Cash surrender value of life insurance policies
Total	37,826	44,257
Fair Value, Inputs, Level 2 [Member]
Cash equivalents
Cash surrender value of life insurance policies	10,211	9,769
Total	$ 10,211	$ 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