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Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Operating activities:    
Net income $ 607,817 $ 408,117
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 127,384 128,553
Stock options issued for services 35,599 26,502
Changes in other assets and liabilities:    
Accounts receivable (2,747,163) 68,158
Inventory (676,722) (1,465,897)
Costs and estimated earnings in excess of billings 1,628,592 72,559
Other current assets 132,242 275,142
Accounts payable (1,519,105) 346,473
Accrued commissions 69,237 (100,157)
Billings in excess of costs and estimated earnings (433,292) 323,962
Other current liabilities 27,503 1,055,413
Net operating activities (2,747,908) 1,138,825
Investing activities:    
Acquisition of property and equipment (528,188) (410,681)
Other investing activities (1,346) (1,347)
Net investing activities (529,534) (412,028)
Financing activities:    
Net short-term borrowings 3,478,343 (1,372)
Proceeds from issuance of common stock, net 2,963 2,559
Acquisition of treasury stock    (49,767)
Net financing activities 3,481,306 (48,580)
Net change in cash and cash equivalents 203,864 678,217
Cash and cash equivalents - beginning 73,952 2,193,534
Cash and cash equivalents - ending $ 277,816 $ 2,871,751