CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Cash flows from operating activities:
Net loss	$ (72,335)	$ (219,268)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	58,874	63,420
Change in provision for losses on accounts receivable	(14,314)	(15,541)
Inventory reserve	(92)	20,782
Gain on disposal of equipment		(665)
Stock option expense	292	1,013
Decrease in deferred rent liability	(5,571)	(3,691)
Changes in assets and liabilities:
Accounts receivable	(87,835)	675,047
Inventories	(81,710)	(135,203)
Prepaid expenses and other assets	(13,737)	(38,825)
Accounts payable and other accrued expenses	18,759	(207,546)
Accrued compensation	2,026	4,118
Net cash (used in) provided by operating activities	(195,643)	143,641
Cash flows from investing activities:
Purchases of property and equipment	(5,680)	(3,675)
Proceeds from sale of equipment		1,900
Net cash used in investing activities	(5,680)	(1,775)
Cash flows from financing activities:
Exercise of stock options	7,549	3,173
Increase in intangibles	(925)	(6,252)
Net cash provided by (used in) financing activities	6,624	(3,079)
Effect of exchange rate changes in cash	(343)	(934)
Net (decrease) increase in cash and cash equivalents	(195,042)	137,853
Cash and cash equivalents at beginning of period	1,088,307	1,509,125
Cash and cash equivalents at end of period	893,265	1,646,978
Cash paid during the period for:
Interest	$ 36	$ 18