Note 11 - Long-term Debt - Net Carrying Amount of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Aug. 31, 2023	May 31, 2023
Carrying amount of long-term debt	$ 372,451	$ 395,422
Credit Facility Due in November 2025 [Member]
Carrying amount of long-term debt	44,400	45,260
Term Loan Due in July 2033 [Member]
Carrying amount of long-term debt	10,905	10,959
Term Loan Due in April 2032 [Member]
Carrying amount of long-term debt	13,105	13,092
Term Loan Due in August 2026 [Member]
Carrying amount of long-term debt	330	346
Mortgage Payable Due in August 2026 [Member]
Carrying amount of long-term debt	2,128	2,104
Term Loan Due in December 2023, One [Member]
Carrying amount of long-term debt	545	803
Term Loan Due in December 2023, Two [Member]
Carrying amount of long-term debt	442	755
Term Loan Due in April 2025 [Member]
Carrying amount of long-term debt	732	819
Term Loan Due in August 2028 [Member]
Carrying amount of long-term debt	3,702	1,706
Mortgage Payable Due in October 2030 [Member]
Carrying amount of long-term debt	20,688	20,863
Term Loan Due in June 2028 [Member]
Carrying amount of long-term debt	70,000	65,000
Long-term Debt, Excluding Convertible Debentures [Member]
Carrying amount of long-term debt	166,977	161,707
Unamortized financing fees	(1,098)	(738)
Net carrying amount	165,879	160,969
Less principal portion included in current liabilities	(13,489)	(24,080)
Total noncurrent portion of long-term debt	$ 152,390	$ 136,889

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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