CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Cash flows from operating activities:
Net loss	$ (55,417)	$ (72,335)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	52,978	58,874
Change in provision for losses on accounts receivable	(192)	(14,314)
Inventory reserve	(9,974)	(92)
Stock option expense	172	292
Decrease in deferred rent liability	(7,501)	(5,571)
Changes in assets and liabilities:
Accounts receivable	650	(87,835)
Inventories	22,614	(81,710)
Prepaid expenses and other assets	(21,650)	(13,737)
Accounts payable and accrued expenses	(62,807)	18,759
Accrued compensation	9,195	2,026
Net cash used in operating activities	(71,932)	(195,643)
Cash flows from investing activities:
Purchases of property and equipment		(5,680)
Net cash used in investing activities		(5,680)
Cash flows from financing activities:
Exercise of stock options		7,549
Increase in intangible assets		(925)
Net cash provided by financing activities		6,624
Effect of exchange rate changes in cash	26	(343)
Net decrease in cash and cash equivalents	(71,906)	(195,042)
Cash and cash equivalents at beginning of period	1,888,925	1,088,307
Cash and cash equivalents at end of period	$ 1,817,019	893,265
Cash paid during the period for:
Interest		$ 36