Note 15 - Long-term Debt - Net Carrying Amount of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	May 31, 2026	May 31, 2025
Mortgage Payable Due in February 2028 [Member]
Carrying amount of long-term debt	$ 34,310	$ 38,690
Mortgage Payable Due in July 2033 One [Member]
Carrying amount of long-term debt	8,420	11,501
Mortgage Payable Due in July 2033 Two [Member]
Carrying amount of long-term debt	10,356	9,354
Term Loan Due in August 2026 [Member]
Carrying amount of long-term debt	23	157
Mortgage Payable Due in August 2026 [Member]
Carrying amount of long-term debt	1,890	2,020
Term Loan Due in August 2028 [Member]
Carrying amount of long-term debt	1,822	2,546
Mortgage Payable Due in October 2030 [Member]
Carrying amount of long-term debt	18,669	19,418
Term Loan Due in June 2028 [Member]
Carrying amount of long-term debt	63,688	80,438
Long-term Debt, Excluding Convertible Debentures [Member]
Carrying amount of long-term debt	139,178	164,124
Unamortized financing fees	(593)	(864)
Net carrying amount	138,585	163,260
Less principal portion included in current liabilities	(18,160)	(14,767)
Total noncurrent portion of long-term debt	$ 120,425	$ 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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