Note 11 - Long-term Debt - Net Carrying Amount of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Nov. 30, 2022	May 31, 2022
Credit Facility Due in November 2022 [Member]
Carrying amount of long-term debt	$ 48,840	$ 53,720
Term Loan Due in July 2023 [Member]
Carrying amount of long-term debt	11,533	12,750
Term Loan Due in April 2032 [Member]
Carrying amount of long-term debt	13,631	15,050
Term Loan Due in August 2026 [Member]
Carrying amount of long-term debt	391	462
Mortgage Payable Due in August 2026 [Member]
Carrying amount of long-term debt	2,147	2,327
Term Loan Due in December 2023, One [Member]
Carrying amount of long-term debt	1,300	1,878
Term Loan Due in December 2023, Two [Member]
Carrying amount of long-term debt	1,560	0
Term Loan Due in December 2023, Three [Member]
Carrying amount of long-term debt	1,300	1,878
Term Loan Due in April 2025 [Member]
Carrying amount of long-term debt	1,041	1,219
Term Loan Due in June 2025 [Member]
Carrying amount of long-term debt	1,021	1,307
Mortgage Payable Due in October 2030 [Member]
Carrying amount of long-term debt	21,217	21,561
Term Loan Due in March 2024 [Member]
Carrying amount of long-term debt	70,000	75,000
Long-term Debt, Excluding Convertible Debentures [Member]
Carrying amount of long-term debt	173,981	187,152
Unamortized financing fees	(1,150)	(1,450)
Net carrying amount	172,831	185,702
Less principal portion included in current liabilities	(20,681)	(67,823)
Total noncurrent portion of long-term debt	$ 152,150	$ 117,879

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 unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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