Note 4 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2022	Oct. 01, 2022
Cash equivalents	$ 42,592	$ 48,045
Cash surrender value of life insurance policies	10,382	9,938
Total	52,974	57,983
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	42,592	48,045
Cash surrender value of life insurance policies	0	0
Total	42,592	48,045
Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Cash surrender value of life insurance policies	10,382	9,938
Total	$ 10,382	$ 9,938

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