Note 8 - Deferred Revenue (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022	May 31, 2023
Revenue from Contract with Customer, Excluding Assessed Tax	$ 15,597,036	$ 12,101,674	$ 33,010,707	$ 31,055,273
Pallets [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			0	$ 5,306,040
Deferred Revenue, Current	$ 23,007		$ 23,007		$ 23,007