Note 11 - Long-term Debt - Net Carrying Amount of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Feb. 28, 2026	May 31, 2025
Term Loan Due in February 2028 [Member]
Carrying amount of long-term debt	$ 35,770	$ 38,690
Term Loan Due in July 2033 [Member]
Carrying amount of long-term debt	10,647	11,501
Term Loan Due in July 2033 Two [Member]
Carrying amount of long-term debt	8,660	9,354
Term Loan Due in August 2026 [Member]
Carrying amount of long-term debt	57	157
Mortgage Payable Due in August 2026 [Member]
Carrying amount of long-term debt	1,924	2,020
Term Loan Due in August 2028 [Member]
Carrying amount of long-term debt	2,047	2,546
Mortgage Payable Due in October 2030 [Member]
Carrying amount of long-term debt	18,858	19,418
Term Loan Due in June 2028 [Member]
Carrying amount of long-term debt	75,375	80,438
Long-term Debt, Excluding Convertible Debentures [Member]
Carrying amount of long-term debt	153,338	164,124
Unamortized financing fees	(903)	(864)
Net carrying amount	152,435	163,260
Less principal portion included in current liabilities	(17,453)	(14,767)
Total non-current portion of long-term debt	$ 134,982	$ 148,493

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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