Note 11 - Long-term Debt - Net Carrying Amount of Long-term Debt Instruments (Details) (Parentheticals) € in Thousands, $ in Thousands, $ in Thousands	3 Months Ended			12 Months Ended
	Aug. 31, 2023 USD ($)	Aug. 31, 2023 CAD ($)	Aug. 31, 2023 EUR (€)	May 31, 2023 USD ($)	May 31, 2023 CAD ($)	May 31, 2023 EUR (€)	Aug. 31, 2023 CAD ($)	Aug. 31, 2023 EUR (€)	May 31, 2023 CAD ($)	May 31, 2023 EUR (€)
Credit Facility Due in November 2025 [Member]
Face amount							$ 66,000		$ 66,000
Term (Year)	3 years	3 years	3 years	3 years	3 years	3 years
Amortization period (Year)	10 years	10 years	10 years	10 years	10 years	10 years
Maturity	Nov. 30, 2025	Nov. 30, 2025	Nov. 30, 2025	Nov. 30, 2025	Nov. 30, 2025	Nov. 30, 2025
Term Loan Due in July 2033 [Member]
Face amount	$ 25,000			$ 25,000
Term (Year)	5 years	5 years	5 years	5 years	5 years	5 years
Amortization period (Year)	15 years	15 years	15 years	15 years	15 years	15 years
Maturity	Jul. 31, 2033	Jul. 31, 2033	Jul. 31, 2033	Jul. 31, 2033	Jul. 31, 2033	Jul. 31, 2033
Periodic payment	$ 181			$ 181
Term Loan Due in July 2033 [Member] | Prime Rate [Member]
Variable rate	1.00%	1.00%	1.00%	1.00%	1.00%	1.00%
Term Loan Due in April 2032 [Member]
Face amount							25,000		25,000
Term (Year)	5 years	5 years	5 years	5 years	5 years	5 years
Amortization period (Year)	15 years	15 years	15 years	15 years	15 years	15 years
Maturity	Jul. 31, 2033	Jul. 31, 2033	Jul. 31, 2033	Jul. 31, 2033	Jul. 31, 2033	Jul. 31, 2033
Periodic payment		$ 196			$ 196
Term Loan Due in April 2032 [Member] | Prime Rate [Member]
Variable rate	1.00%	1.00%	1.00%	1.00%	1.00%	1.00%
Term Loan Due in August 2026 [Member]
Face amount							1,250		1,250
Term (Year)	5 years	5 years	5 years	5 years	5 years	5 years
Amortization period (Year)	10 years	10 years	10 years	10 years	10 years	10 years
Maturity	Aug. 31, 2026	Aug. 31, 2026	Aug. 31, 2026	Aug. 31, 2026	Aug. 31, 2026	Aug. 31, 2026
Periodic payment		$ 12			$ 12
Term Loan Due in August 2026 [Member] | Prime Rate [Member]
Variable rate	1.50%	1.50%	1.50%	1.50%	1.50%	1.50%
Mortgage Payable Due in August 2026 [Member]
Face amount							$ 3,750		$ 3,750
Term (Year)	5 years	5 years	5 years	5 years	5 years	5 years
Amortization period (Year)	20 years	20 years	20 years	20 years	20 years	20 years
Maturity	Aug. 31, 2026	Aug. 31, 2026	Aug. 31, 2026	Aug. 31, 2026	Aug. 31, 2026	Aug. 31, 2026
Periodic payment		$ 23			$ 23
Mortgage Payable Due in August 2026 [Member] | Prime Rate [Member]
Variable rate	1.50%	1.50%	1.50%	1.50%	1.50%	1.50%
Term Loan Due in December 2023, One [Member]
Face amount | €								€ 5,000		€ 5,000
Term (Year)	5 years	5 years	5 years	5 years	5 years	5 years
Maturity	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023
Periodic payment | €			€ 250			€ 250
Term Loan Due in December 2023, One [Member] | Euro Interbank Offered Rate [Member]
Variable rate	2.15%	2.15%	2.15%	2.15%	2.15%	2.15%
Term Loan Due in December 2023, Two [Member]
Face amount	$ 1,200			$ 1,200
Term (Year)	1 year	1 year	1 year	1 year	1 year	1 year
Maturity	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023
Periodic payment	$ 100			$ 100
Fixed rate	4.26%			4.26%			4.26%	4.26%	4.26%	4.26%
Term Loan Due in April 2025 [Member]
Face amount	$ 1,500			$ 1,500
Term (Year)	5 years	5 years	5 years	5 years	5 years	5 years
Maturity	Apr. 30, 2025	Apr. 30, 2025	Apr. 30, 2025	Apr. 30, 2025	Apr. 30, 2025	Apr. 30, 2025
Periodic payment	$ 94			$ 94
Fixed rate	2.00%			2.00%			2.00%	2.00%	2.00%	2.00%
Term Loan Due in August 2028 [Member]
Face amount	$ 3,500			$ 3,500
Term (Year)	5 years	5 years	5 years	5 years	5 years	5 years
Maturity	Aug. 31, 2028	Aug. 31, 2028	Aug. 31, 2028	Aug. 31, 2028	Aug. 31, 2028	Aug. 31, 2028
Periodic payment	$ 52			$ 52
Fixed rate	4.59%			4.59%			4.59%	4.59%	4.59%	4.59%
Mortgage Payable Due in October 2030 [Member]
Face amount	$ 22,635			$ 22,635
Term (Year)	10 years	10 years	10 years	10 years	10 years	10 years
Amortization period (Year)	10 years	10 years	10 years	10 years	10 years	10 years
Maturity	Oct. 31, 2030	Oct. 31, 2030	Oct. 31, 2030	Oct. 31, 2030	Oct. 31, 2030	Oct. 31, 2030
Periodic payment	$ 57			$ 57
Mortgage Payable Due in October 2030 [Member] | Euro Interbank Offered Rate [Member]
Variable rate	1.50%	1.50%	1.50%	1.50%	1.50%	1.50%
Term Loan Due in June 2028 [Member]
Face amount	$ 70,000			$ 70,000
Term (Year)	5 years	5 years	5 years	5 years	5 years	5 years
Maturity	Jun. 30, 2028	Jun. 30, 2028	Jun. 30, 2028	Jun. 30, 2028	Jun. 30, 2028	Jun. 30, 2028
Term Loan Due in June 2028 [Member] | Minimum [Member]
Periodic payment	$ 875			$ 875
Term Loan Due in June 2028 [Member] | Maximum [Member]
Periodic payment	$ 1,750			$ 1,750