Note 7 - Bank Credit Facility (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	May 15, 2024	Aug. 31, 2024
Secured Overnight Financing Rate	us-gaap:SecuredOvernightFinancingRateSofrMember
Bank One [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 25,000
Letters of Credit Outstanding, Amount		$ 6,013
Debt Instrument, Basis Spread on Variable Rate		1.75%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.25%
Debt Instrument, Covenant, Minimum Tangible Net Worth		$ 120,000
Debt Instrument, Covenant, Letters of Credit Outstanding, Minimum Amount		$ 8,250
Debt Instrument, Covenant, Fixed Charge Coverage Ratio		1.2
Debt Instrument, Covenant, Lease-adjusted Leverage Ratio		3.35