Condensed Consolidated Statements of Income (unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2025	Feb. 29, 2024
Condensed Consolidated Statements of Income (unaudited)
Sales, net	$ 10,564,834	$ 12,254,093	$ 30,731,571	$ 32,517,596
Cost of goods sold	6,035,961	6,501,227	16,812,968	17,569,487
Gross profit	4,528,873	5,752,866	13,918,603	14,948,109
Research and development costs	146,749	108,363	318,863	321,518
Selling, general and administrative expenses	2,362,522	2,651,289	7,731,052	7,660,172
Operating income	2,019,602	2,993,214	5,868,688	6,966,419
Other income	325,643	362,707	1,010,268	1,122,713
Income before provision for income taxes	2,345,245	3,355,921	6,878,956	8,089,132
Provision for income taxes	343,000	659,000	1,153,896	1,563,000
Net income	$ 2,002,245	$ 2,696,921	$ 5,725,060	$ 6,526,132
Basic and diluted earnings per common share	$ 0.64	$ 0.82	$ 1.83	$ 1.91