CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	9 Months Ended
Feb. 29, 2012	Feb. 28, 2011
Cash flows from operating activities:
Net income	$ 494,329	$ 61,354
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	129,798	109,610
Stock option expense	29,956	18,982
Change in provision for losses on accounts receivable	37,106	(8,904)
Inventory reserve	2,692	(5,361)
Write-off of license-related intangible asset	0	13,982
Changes in assets and liabilities
Accounts receivable	(633,448)	33,580
Inventories	(79,169)	(39,409)
Prepaid expenses and other assets	54,516	63,753
Other assets	(5,660)	21,579
Accounts payable and other accrued expenses	259	(125,990)
Accrued compensation	47,499	(77,288)
Income tax payable	25,256	0
Net cash provided by operating activities	103,134	65,888
Cash flows from investing activities:
Increase in intangibles	(50,000)	(98,774)
Purchases of property and equipment	(135,528)	(83,695)
Net cash used in investing activities	(185,528)	(182,469)
Cash flows from financing activities:
Proceeds from exercise of stock option	28,500	0
Payments on equipment loan	(35,390)	(33,550)
Net cash used in financing activities	(6,890)	(33,550)
Effect of exchange rate changes in cash	(1,528)	(1,013)
Net decrease in cash and cash equivalents	(90,812)	(151,144)
Cash and cash equivalents at beginning of period	989,270	1,055,206
Cash and cash equivalents at end of period	898,458	904,062
Supplemental Disclosure of Cash-Flow Information:
Cash paid during the period for Interest	$ 1,018	$ 4,917

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).