Note 5 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jan. 02, 2021	Oct. 03, 2020
Cash equivalents	$ 52,725	$ 72,234
Cash surrender value of life insurance policies	11,127	10,584
Total	63,852	82,818
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	52,725	72,234
Cash surrender value of life insurance policies	0	0
Total	52,725	72,234
Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Cash surrender value of life insurance policies	11,127	10,584
Total	$ 11,127	$ 10,584

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