Note 5 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 28, 2020	Sep. 28, 2019
Cash equivalents	$ 40,108	$ 37,826
Cash surrender value of life insurance policies	9,537	10,211
Total	49,645	48,037
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	40,108	37,826
Cash surrender value of life insurance policies
Total	40,108	37,826
Fair Value, Inputs, Level 2 [Member]
Cash equivalents
Cash surrender value of life insurance policies	9,537	10,211
Total	$ 9,537	$ 10,211

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