Note 8 - Deferred Revenue (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023	May 31, 2023
Revenue from Contract with Customer, Excluding Assessed Tax	$ 13,980,009	$ 13,578,269	$ 46,990,716	$ 44,633,542
Pallets [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			0	6,378,040
Contract with Customer, Liability, Revenue Recognized			545,292	$ 1,072,000
Deferred Revenue, Current	$ 568,299		$ 568,299		$ 23,007