Note 6 - Borrowings - Long-term Debt (Details) (Parentheticals) - USD ($) $ in Millions	Dec. 25, 2021	Jul. 07, 2021	Dec. 26, 2020
Senior Secured Debt [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50
Interest rate	3.00%		2.15%
Term Loan [Member]
Interest rate	2.97%
Debt Instrument, Face Amount	$ 50	$ 50

Face (par) amount of debt instrument at time of issuance.

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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant