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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Nov. 30, 2017
Nov. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 264,956 $ 28,460
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 279,848 365,640
Stock based compensation expense 31,536 33,415
Inventory reserve 77,601 56,979
(Increase) Decrease in:    
Accounts receivable 172,465 166,536
Inventories (240,144) 174,287
Prepaid expenses and other current assets 20,841 24,670
Increase (Decrease) in:    
Accounts payable and accrued expenses 186,659 (68,618)
Customer deposits 573,650 238,272
Income taxes payable 37,555 (42,877)
Net Cash Provided by Operating Activities 1,404,967 976,764
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of equipment and furnishings (157,727) (170,659)
Purchase of marketable securities (1,994,175) (319,702)
Net Cash (Used in) Investing Activities (2,151,902) (490,361)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercise of stock options 210  
Repayments of notes payable and loans (111,777) (107,045)
Net Cash (Used In) Financing Activities (111,567) (107,045)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (858,502) 379,358
CASH AND CASH EQUIVALENTS    
Beginning of period 2,557,223 2,388,355
End of period 1,698,721 2,767,713
SUPPLEMENTAL DISCLOSURE:    
Interest paid 35,330 39,960
Taxes Paid $ 58,969 $ 42,877