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Significant Accounting Policies (Details Narrative) - USD ($) | 12 Months Ended
--- | ---
Feb. 28, 2021 | Feb. 29, 2020
Advertising expense | $ 78,206 | $ 297,297
Concentration of Credit Risk |  | 71.00%
Marketable securities including mutual funds | 4,563,470 | $ 4,219,240
Grant receivable |  | 100,000
Energy efficiency related improvements |  | 580,000
Capital expenditure grant proceeds | 100,000 |
Accumulated amortization of patents | 181,922 | $ 171,210
Annual Amortization Expense of Intangible Assets For the Next Five Years |  |
Annual amortization expense this year | 11,000 |
Annual amortization expense year two | 11,000 |
Annual amortization expense year three | 11,000 |
Annual amortization expense year four | 11,000 |
Annual amortization expense year five | $ 11,000 |
Domestic Patents |  |
Useful life of intangible assets | 17 years |
Foreign Patents |  |
Useful life of intangible assets | 12 years |
Equipment and Furnishings |  |
Annual Amortization Expense of Intangible Assets For the Next Five Years |  |
Property, plant and equipment, estimated useful lives | Three to Five Years |
Depreciation method used for equipment and furnishings | Straight-Line Method |
Buildings |  |
Annual Amortization Expense of Intangible Assets For the Next Five Years |  |
Property, plant and equipment, estimated useful lives | 40 Years |
Depreciation method used for equipment and furnishings | Straight-Line Method |
Sales | Customer |  |
Concentration of Credit Risk | 28.00% | 30.00%
Accounts Receivable | Customer |  |
Concentration of Credit Risk | 64.00% | 67.00%

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