Note 4 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Dec. 28, 2019	Sep. 28, 2019
Cash equivalents	$ 68,265	$ 37,826
Cash surrender value of life insurance policies	10,592	10,211
Total	78,857	48,037
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	68,265	37,826
Cash surrender value of life insurance policies
Total	68,265	37,826
Fair Value, Inputs, Level 2 [Member]
Cash equivalents
Cash surrender value of life insurance policies	10,592	10,211
Total	$ 10,592	$ 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.

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