Note 5 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 29, 2018	Sep. 30, 2017
Cash equivalents	$ 44,257	$ 31,659
Cash surrender value of life insurance policies	9,769	9,026
Total	54,026	40,685
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	44,257	31,659
Cash surrender value of life insurance policies
Total	44,257	31,659
Fair Value, Inputs, Level 2 [Member]
Cash equivalents
Cash surrender value of life insurance policies	9,769	9,026
Total	$ 9,769	$ 9,026

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