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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Nov. 30, 2015
Nov. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 541,176 $ 384,100
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 341,342 295,297
Stock based compensation expense 33,967 34,287
Allowance for doubtful accounts (3,047) 9,000
Inventory reserve 90,000 $ 90,000
Unrealized loss on marketable securities 55,980
(Increase) Decrease in:    
Accounts receivable 69,538 $ (78,288)
Inventories (418,577) (567,520)
Prepaid expenses and other current assets 29,582 78,733
Increase (Decrease) in:    
Accounts payable and accrued expenses (25,532) 351,716
Customer deposits (103,230) (35,631)
Income taxes payable (82,757) 37,894
Net Cash Provided by Operating Activities 528,442 599,588
CASH FLOWS FROM INVESTING ACTIVITIES:    
Patent application and other asset costs (14,786) (21,225)
Purchase of equipment and furnishings (419,368) (208,702)
Purchase of marketable securities (33,680) (1,006,921)
Net Cash (Used in) Investing Activities (467,834) $ (1,236,848)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercise of stock options 2,675
Repayments of notes payable and loans (123,351) $ (143,913)
Net Cash (Used In) Financing Activities (120,676) (143,913)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (60,068) (781,173)
CASH AND CASH EQUIVALENTS    
Beginning of period 2,562,782 3,232,021
End of period 2,502,714 2,450,848
SUPPLEMENTAL DISCLOSURE:    
Interest paid 44,395 49,135
Taxes Paid $ 228,714 $ 127,046