CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	May 31, 2022	May 31, 2021
Cash flows from operating activities:
Net loss	$ (4,531,044)	$ (7,446,254)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	339,096	138,267
Loss on disposal of property and equipment	52,587
Provision for allowance on accounts receivable	(684,184)	766,434
Inventory reserve	(771,736)	1,550,594
Stock option expense	1,260,195	1,354,609
Amortization of right-of-use asset	255,725	237,588
Changes in assets and liabilities:
Accounts receivable	1,365,417	(455,614)
Inventories	1,561,544	(1,906,013)
Prepaid expenses and other	50,007	1,138,793
Reduction in lease liability	(244,412)	(241,132)
Other assets	168,563	(95,958)
Accounts payable and accrued expenses	388,992	(403,331)
Accrued compensation	258,048	110,269
Advance from customers	50,670
Net cash used in operating activities	(480,532)	(5,251,748)
Cash flows from investing activities:
Expenditure related to intangibles	(113,436)	(159,727)
Purchases of property and equipment	(56,900)	(135,856)
Net cash used in investing activities	(170,336)	(295,583)
Cash flows from financing activities:
Gross proceeds from sale of common stock	2,401,734	1,177,394
Costs from sale of common stock	(84,574)	(165,919)
Proceeds from exercise of stock options	77,360	102,255
Net cash provided by financing activities	2,394,520	1,113,730
Effect of exchange rate changes in cash	(25,980)	(8,115)
Net increase (decrease) in cash and cash equivalents	1,717,672	(4,441,716)
Cash and cash equivalents at beginning of year	4,199,311	8,641,027
Cash and cash equivalents at end of year	5,916,983	4,199,311
Cash paid during the year for:
Income taxes	23,719	27,171
Non-cash investing and financing activities:
Increase in right-of-use asset due to lease extension or establishment	4,478	79,159
Increase in lease liability due to lease extension or establishment	4,478	79,159
Write off of fixed assets, cost	819,931
Write off of fixed assets, accumulated depreciation	767,344
Write off of intangible assets, cost	246,756
Write off of intangible assets, accumulated amortization	$ 37,221