CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	May 31, 2013	May 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 536,957	$ 548,435
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	216,708	180,124
Change in provision for losses on accounts receivable	2,539	80,987
Inventory reserve	3,891	(7,841)
Gain on disposal of property and equipment		(101,628)
Stock option expense	20,865	53,616
(Decrease) increase in deferred rent liability	(5,076)	1,338
Decrease in deferred tax assets	9,000
Changes in assets and liabilities:
Accounts receivable	326,317	(534,428)
Inventories	245,960	(27,706)
Prepaid expenses and other	14,022	26,863
Other assets	7,173	(30,673)
Accounts payable and other accrued expenses	(5,454)	(90,460)
Accrued compensation	21,135	48,785
Net cash provided by operating activities	1,394,037	147,412
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(257,121)	(164,798)
Purchases of intangible assets		(50,000)
Proceeds from insurance claim		101,628
Net cash used in investing activities	(257,121)	(113,170)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from sale of common stock	250,000
Net (payments) borrowings on line of credit	(43,000)	43,000
Proceeds from exercise of stock options	51,514	47,790
Payments on loan for equipment purchase		(35,390)
Net cash provided by financing activities	258,514	55,400
Effect of exchange rate changes on cash	(2,976)	(1,570)
Net increase in cash and cash equivalents	1,392,454	88,072
CASH AND CASH EQUIVALENTS, beginning of year	1,077,342	989,270
CASH AND CASH EQUIVALENTS, end of year	2,469,796	1,077,342
SUPPLEMENTAL DISCLOSURE OF CASH-FLOW INFORMATION
Cash paid during year for Interest	$ 302	$ 1,585