CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Cash flows from operating activities:
Net loss	$ (207,059)	$ (55,417)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	48,833	52,978
Change in provision for losses on accounts receivable	7,514	(192)
Inventory reserve	(8)	(9,974)
Stock option expense	4,383	172
Increase(decrease)in deferred rent liability	5,563	(7,501)
Changes in assets and liabilities:
Accounts receivable	5,202	650
Inventories	(62,379)	22,614
Prepaid expenses and other assets	(19,053)	(21,650)
Accounts payable and accrued expenses	82,480	(62,807)
Accrued compensation	9,810	9,195
Net cash used in operating activities	(124,714)	(71,932)
Cash flows from investing activities:
Purchases of property and equipment	(19,974)
Net cash used in investing activities	(19,974)
Cash flows from financing activities:
Exercise of stock options	1,038
Net cash provided by financing activities	1,038
Effect of exchange rate changes in cash	(824)	26
Net decrease in cash and cash equivalents	(144,474)	(71,906)
Cash and cash equivalents at beginning of period	1,225,462	1,888,925
Cash and cash equivalents at end of period	1,080,988	1,817,019
Cash paid during the period for:
Interest