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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Nov. 30, 2016
Nov. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 28,460 $ 541,176
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 365,640 341,342
Stock based compensation expense 33,415 33,967
Allowance for doubtful accounts (3,047)
Inventory reserve 56,979 90,000
Unrealized loss on marketable securities 55,980
(Increase) Decrease in:    
Accounts receivable 166,536 69,538
Inventories 174,287 (418,577)
Prepaid expenses and other current assets 24,670 29,582
Increase (Decrease) in:    
Accounts payable and accrued expenses (68,618) (25,532)
Customer deposits 238,272 (103,230)
Income taxes payable (42,877) (82,757)
Net Cash Provided by Operating Activities 976,764 528,442
CASH FLOWS FROM INVESTING ACTIVITIES:    
Patent application and other asset costs (14,786)
Purchase of equipment and furnishings (170,659) (419,368)
Purchase of marketable securities (319,702) (33,680)
Net Cash (Used in) Investing Activities (490,361) (467,834)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercise of stock options 2,675
Repayments of notes payable and loans (107,045) (123,351)
Net Cash (Used In) Financing Activities (107,045) (120,676)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 379,358 (60,068)
CASH AND CASH EQUIVALENTS    
Beginning of period 2,388,355 2,562,782
End of period 2,767,713 2,502,714
SUPPLEMENTAL DISCLOSURE:    
Interest paid 39,960 44,395
Income Taxes Paid $ 42,877 $ 228,714