CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Cash flows from operating activities:
Net income	$ 528,550	$ 312,884
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	110,822	86,671
Stock option expense		11,032
Change in provision for losses on accounts receivable	4,210	32,979
Inventory reserve	2,047	2,495
Increase (decrease) in deferred rent liability	(1,764)	1,554
Changes in assets and liabilities:
Accounts receivable	(313,358)	(418,116)
Inventories	18,921	113,766
Prepaid expenses and other assets	49,413	113,820
Accounts payable and other accrued expenses	(27,461)	(187,027)
Accrued compensation	25,618	6,232
Net cash provided by operating activities	396,998	76,290
Cash flows from investing activities:
Increase in intangibles		(25,000)
Purchases of property and equipment	(242,416)	(49,321)
Net cash used in investing activities	(242,416)	(74,321)
Cash flows from financing activities:
Proceeds from exercise of stock options	5,999
Payments on line of credit or equipment loan	(43,000)	(23,648)
Net cash used in financing activities	(37,001)	(23,648)
Effect of exchange rate changes in cash	(554)	(1,623)
Net increase (decrease) in cash and cash equivalents	117,027	(23,302)
Cash and cash equivalents at beginning of period	1,077,342	989,270
Cash and cash equivalents at end of period	1,194,369	965,968
Supplemental Disclosure of Cash-Flow Information:
Interest	307	899
Income taxes	$ 108,160