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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
May 31, 2013
May 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 73,748 $ 11,100
Depreciation and amortization 82,923 83,576
Stock based compensation expense 4,410 10,964
Allowance for doubtful accounts 3,000 3,000
Inventory reserve 13,343   
Decrease (Increase) in:    
Accounts receivable 78,417 (307,798)
Inventories 112,707 26,561
Prepaid expenses and other current assets 2,446 (5,483)
(Decrease) Increase in:    
Accounts payable and accrued expenses 36,620 28,175
Customer deposits 129,376 (45,109)
Income taxes payable 20,188 (30,866)
Net Cash Provided by (Used In) Operating Activities 557,178 (225,880)
CASH FLOW FROM INVESTING ACTIVITIES:    
Patent application costs (7,782) (24,115)
Purchase of equipment and furnishings (18,698) (9,412)
Sale (Purchase) of marketable securities 2,510 (400,106)
Net Cash (Used In) Investing Activities (23,970) (433,633)
CASH FLOW FROM FINANCING ACTIVITIES:    
Repayments of notes payable and loans (31,049) (29,862)
Proceeds from exercise of options    9,006
Net Cash (Used In) Financing Activities (31,049) (20,856)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 502,159 (680,369)
CASH AND CASH EQUIVALENTS    
Beginning of period 1,940,906 2,531,689
End of period 2,443,065 1,851,320
SUPPLEMENTAL DISCLOSURE:    
Interest paid 27,775 28,970
Taxes Paid $ 0 $ 38,848