Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Income Statement [Abstract]
Net sales	$ 1,848,913	$ 1,668,444	$ 8,570,053	$ 5,205,641
Cost of revenue	912,076	837,254	3,618,925	2,804,694
Gross profit	936,837	831,190	4,951,128	2,400,947
Operating expenses
Selling, general and administrative	3,312,388	3,313,918	11,604,964	8,492,150
Transaction costs	0	0	0	125,167
Research and development	10,771	21,732	25,616	57,062
Total operating expenses	3,323,159	3,335,650	11,630,580	8,674,379
Operating loss	(2,386,322)	(2,504,460)	(6,679,452)	(6,273,432)
Bargain purchase gain	0	(2,277)	0	1,187,235
Gain on sale of property and equipment			4,598,095
Forgiveness of PPP loan	1,471,292	0	2,059,826	0
Interest expense	(8,232)	(5,400)	(37,811)	(12,854)
Other income, net	38,286	90,703	323,589	58,777
Income (loss) before income taxes	(884,976)	(2,421,434)	264,247	(5,040,274)
Income tax provision (benefit)	8,268	(1,637)	14,618	(404,667)
Net income (loss)	$ (893,244)	$ (2,419,797)	$ 249,629	$ (4,635,607)
Net income (loss) per common share
Basic	$ (0.24)	$ (0.64)	$ 0.07	$ (1.23)
Weighted-average number of common shares, basic	3,788,315	3,764,536	3,790,022	3,759,369
Diluted	$ (0.24)	$ (0.64)	$ 0.07	$ (1.23)
Weighted-average number of common shares, diluted	3,788,315	3,764,536	3,813,675	3,759,369