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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Cash flows from operating activities:    
Net income $ 492,937 $ 494,329
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 164,411 129,798
Stock option expense 17,155 29,956
Change in provision for losses on accounts receivable (4,133) 37,106
Inventory reserve 3,891 2,692
Decrease in deferred rent liability (3,420) (1,554)
Changes in assets and liabilities:    
Accounts receivable 691,339 (633,448)
Inventories 111,943 (79,169)
Prepaid expenses and other assets (13,548) 54,516
Accounts payable and other accrued expenses 7,362 27,069
Other assets (2,767) (5,660)
Accrued compensation 30,870 47,499
Net cash provided by operating activities 1,496,040 103,134
Cash flows from investing activities:    
Increase in intangibles   (50,000)
Purchases of property and equipment (249,410) (135,528)
Net cash used in investing activities (249,410) (185,528)
Cash flows from financing activities:    
Proceeds from exercise of stock options 40,414 28,500
Payments on line of credit or equipment loan (43,000) (35,390)
Net cash used in financing activities (2,586) (6,890)
Effect of exchange rate changes in cash (2,709) (1,528)
Net increase (decrease) in cash and cash equivalents 1,241,335 (90,812)
Cash and cash equivalents at beginning of period 1,077,342 989,270
Cash and cash equivalents at end of period 2,318,677 898,458
Supplemental Disclosure of Cash-Flow Information:    
Interest 302 899
Income taxes $ 108,160