CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Cash flows from operating activities:
Net loss	$ (4,973,889)	$ (1,852,482)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	94,550	94,772
Change in allowance on accounts receivable	578,438	3,571
Inventory reserve	1,437,547	5,684
Stock option expense	261,176	192,917
Reduction in deferred rent liability		(37,971)
Amortization of right-of-use asset	173,919	213,032
Changes in assets and liabilities:
Accounts receivable	(690,691)	488,759
Inventories	(1,446,766)	(42,199)
Prepaid expenses	734,966	4,898
Reduction in lease liability	(156,384)	(150,485)
Other assets	(114,664)	(689)
Accounts payable and accrued expenses	(230,575)	268,068
Accrued compensation	88,309	9,214
Net cash used in operating activities	(4,244,064)	(802,911)
Cash flows from investing activities:
Increase in intangibles	(116,881)	(23,933)
Purchases of property and equipment	(106,760)	(27,724)
Net cash used in investing activities	(223,641)	(51,657)
Cash flows from financing activities:
Proceeds from sale of common stock, net	1,011,475	366,258
Proceeds from sale of convertible preferred stock, net		1,917,586
Proceeds from exercise of stock options	96,455	79,828
Proceeds from equity financing-officer		200,000
Net cash provided by financing activities	1,107,930	2,563,672
Effect of exchange rate changes in cash	(8,687)	(4,157)
Net (decrease) increase in cash and cash equivalents	(3,368,462)	1,704,947
Cash and cash equivalents at beginning of period	8,641,027	686,785
Cash and cash equivalents at end of period	5,272,565	2,391,732
Cash paid during the period for:
Interest		9
Income taxes	13,730	12,170
Non-cash investing and financing activities:
Establishment of Right-Of-Use Asset per ASC 842		1,942,999
Establishment of Lease Liability per ASC 842		$ 1,980,970