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Note 13 - Investments (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 25, 2023 | Mar. 26, 2022 | Mar. 25, 2023 | Mar. 26, 2022
Proceeds from Sale and Maturity of Marketable Securities | $ 2,000,000.0 | $ 4,300,000 | $ 5,300,000 | $ 11,526,000
Marketable Securities, Gain (Loss) | 59,000 | (25,000) | 22,000 | (69,000)
Marketable Security, Unrealized Gain (Loss) | $ 59,000 | $ (53,000) | $ 19,000 | $ (58,000)

X
- Definition Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_MarketableSecuritiesUnrealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
Name: | us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration