CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
Cash flows from operating activities:
Net loss	$ (2,071,876)	$ (1,542,581)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	28,971	34,722
Provision for allowance on accounts receivable	229,875	(94,891)
Inventory reserve	136,265	179,744
Stock option expense	303,755	319,622
Amortization of right-of-use asset	67,057	62,897
Changes in assets and liabilities:
Accounts receivable	(388,330)	777,752
Inventories	358,448	164,732
Prepaid expenses and other	81,521	55,069
Reduction in lease liability	(64,801)	(55,649)
Other assets	2,076	(2,431)
Accounts payable and accrued expenses	(301,132)	58,024
Accrued compensation	(54,996)	118,826
Advance from customers	99,853
Net cash (used in) provided by operating activities	(1,573,314)	75,836
Cash flows from investing activities:
Expenditures related to intangibles		(72,375)
Purchases of property and equipment	(33,623)	(5,141)
Net cash used in investing activities	(33,623)	(77,516)
Cash flows from financing activities:
Gross proceeds from sale of common stock	1,810,927	838,333
Costs from sale of common stock	(47,359)	(37,622)
Proceeds from exercise of stock options	13,950	3,895
Net cash provided by financing activities	1,777,518	804,606
Effect of exchange rate changes in cash	(12,527)	(5,613)
Net increase in cash and cash equivalents	158,054	797,313
Cash and cash equivalents at beginning of year	5,916,983	4,199,311
Cash and cash equivalents at end of the period	6,075,037	4,996,624
Cash paid during the period for:
Income taxes	1,957	9,017
Non-cash investing and financing activities:
Write off of intangible assets, cost	6,489
Write off of intangible assets, accumulated amortization	$ 850