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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
May 31, 2019
May 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 25,213 $ 21,430
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 89,207 80,893
Stock based compensation expense 11,310 8,900
Inventory reserve 14,000 18,000
Unrealized loss on marketable securities 49,061
Decrease (Increase) in:    
Accounts receivable 65,538 (198,504)
Inventories (734,704) (89,372)
Prepaid expenses and other current assets 289,992 4,773
(Decrease) Increase in:    
Accounts payable and accrued expenses 410,079 (290,133)
Customer deposits 184,748 2,895
Income taxes payable 6,303 17,564
Net Cash Provided by (Used in) Operating Activities 361,686 (374,493)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of equipment and furnishings (129,159) (101,634)
Sale of marketable securities   40,093
(Purchase) of marketable securities (1,413,481)  
Net Cash (Used in) Investing Activities (1,542,640) (61,541)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of notes payable and loans (40,283) (38,678)
Net Cash Used In Financing Activities (40,283) (38,678)
NET (DECREASE) IN CASH AND CASH EQUIVALENTS (1,221,237) (474,712)
CASH AND CASH EQUIVALENTS    
Beginning of period 3,144,123 2,016,464
End of period 1,922,886 1,541,752
SUPPLEMENTAL DISCLOSURE:    
Interest paid $ 8,947 $ 10,614