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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
 3 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Cash flows from operating activities:    
Net loss $ (219,268) $ (167,714)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 63,420 50,235
Change in provision for losses on accounts receivable (15,541) 4,675
Inventory reserve 20,782 (6,713)
Gain on disposal of equipment (665)   
Stock option expense 1,013 881
Decrease in deferred rent liability (3,691) (1,656)
Changes in assets and liabilities:    
Accounts receivable 675,047 (36,264)
Inventories (135,203) (213,509)
Prepaid expenses and other assets (38,825) 15,527
Accounts payable and other accrued expenses (207,546) (25,609)
Accrued compensation 4,118 3,876
Net cash provided by (used in) operating activities 143,641 (376,271)
Cash flows from investing activities:    
Purchases of property and equipment (3,675) (8,731)
Proceeds from sale of equipment 1,900   
Net cash used in investing activities (1,775) (8,731)
Cash flows from financing activities:    
Exercise of stock options 3,173 760
Increase in intangibles (6,252)   
Net cash (used in) provided by financing activities (3,079) 760
Effect of exchange rate changes in cash (934) (91)
Net increase (decrease) in cash and cash equivalents 137,853 (384,333)
Cash and cash equivalents at beginning of period 1,509,125 2,469,796
Cash and cash equivalents at end of period 1,646,978 2,085,463
Supplemental Disclosure of Cash-Flow Information:    
Cash paid during the period for: Interest $ 18