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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 95,706 $ 547,729
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 440,223 476,528
Stock based compensation expense 47,319 43,402
Inventory reserve 80,006 (119,924)
Allowance for doubtful accounts   2,953
Deferred tax expense 5,750 106,826
(Increase) Decrease in:    
Accounts receivable 63,912 (188,416)
Inventories 524,693 233,718
Prepaid expenses and other assets (17,322) (15,467)
(Decrease) Increase in:    
Accounts payable and accrued expenses (16,017) (55,568)
Customer deposits (122,576) (260,690)
Income taxes payable (73,041) (142,267)
Net Cash Provided by Operating Activities 1,028,653 628,824
CASH FLOW FROM INVESTING ACTIVITIES:    
Purchase of equipment, furnishings and leasehold improvements (182,837) (465,427)
(Purchase) of marketable securities (533,559) (164,825)
Patent application and other asset costs   (17,700)
Net Cash (Used In) Investing Activities (716,396) (647,952)
CASH FLOW FROM FINANCING ACTIVITIES:    
Proceeds from exercise of options   2,885
Repayment of long term debt (143,389) (158,184)
Net Cash (Used In) Financing Activities (143,389) (155,299)
NET (DECREASE) IN CASH AND CASH EQUIVALENTS 168,868 (174,427)
CASH AND CASH EQUIVALENTS    
Beginning of year 2,388,355 2,562,782
End of year 2,557,223 2,388,355
SUPPLEMENTAL CASH FLOW DISCLOSURE:    
Interest paid 52,294 58,447
Income Taxes Paid $ 56,502 $ 230,289