CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
Cash flows from operating activities:
Net (loss) income	$ (411,072)	$ 528,550
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	97,352	110,822
Stock option expense	881
Change in provision for losses on accounts receivable	4,675	4,210
Inventory reserve	(6,713)	2,047
Decrease in deferred rent liability	(6,418)	(1,764)
Changes in assets and liabilities:
Accounts receivable	45,414	(313,358)
Inventories	(321,700)	18,921
Prepaid expenses and other assets	10,316	49,413
Accounts payable and other accrued expenses	(65,525)	(27,461)
Accrued compensation	(87,358)	25,618
Net cash (used in) provided by operating activities	(740,148)	396,998
Cash flows from investing activities:
Purchases of property and equipment	(83,855)	(242,416)
Net cash used in investing activities	(83,855)	(242,416)
Cash flows from financing activities:
Proceeds from exercise of stock options	1,780	5,999
Payments on line of credit or equipment loan		(43,000)
Net cash provided by (used in) financing activities	1,780	(37,001)
Effect of exchange rate changes in cash	(14)	(554)
Net (decrease) increase in cash and cash equivalents	(822,237)	117,027
Cash and cash equivalents at beginning of period	2,469,796	1,077,342
Cash and cash equivalents at end of period	1,647,559	1,194,369
Supplemental Disclosure of Cash-Flow Information:
Interest		307
Income taxes	$ 3,500	$ 108,160