CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Cash flows from operating activities:
Net loss	$ (991,556)	$ (928,984)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	65,545	89,013
Change in provision for allowance on accounts receivable	3,571	13,192
Inventory reserve	6,873	36,467
Stock option expense	34,978	9,126
Reduction (increase) in deferred rent liability	(37,971)	4,351
Amortization of right-of-use asset	157,356
Changes in assets and liabilities:
Accounts receivable	168,133	(473,799)
Inventories	(46,675)	27,269
Prepaid expenses and other	18,431	106,706
Reduction in lease liability	(102,133)
Accounts payable and accrued expenses	345,211	109,163
Accrued compensation	12,243	6,428
Net cash used in operating activities	(365,994)	(1,001,068)
Cash flows from investing activities:
Increase in intangibles	(15,008)	(31,937)
Purchases of property and equipment	(6,323)	(53,080)
Net cash used in investing activities	(21,331)	(85,017)
Cash flows from financing activities:
Proceeds from sale of common stock, net	307,686	936,702
Proceeds from exercise of stock options	48,928	75,200
Proceeds from equity financing-officer	200,000
Net cash provided by financing activities	556,614	1,011,902
Effect of exchange rate changes on cash	(5,085)	(5,806)
Net increase (decrease) in cash and cash equivalents	164,204	(79,989)
Cash and cash equivalents at beginning of period	686,785	1,204,903
Cash and cash equivalents at end of period	850,989	1,124,914
Cash paid during the period for:
Interest	5	47
Income taxes	7,844	0
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