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Income Taxes - Income tax reconciliation (Details) - USD ($) | 12 Months Ended
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Feb. 28, 2019 | Feb. 28, 2018
Income tax (benefit) reconciliation: |  |
Expected federal income tax | $ 38,101 | $ 156,421
State tax, net of federal | 11,430 | 24,383
Research and development tax credits | (19,588) | (57,994)
Under (Overaccrual) of prior year state taxes |  | 40,793
Change in recapture tax rate from 39.3% to 27.3% |  | 15,343
Permanent timing difference | 2,272 | 33,107
Change in valuation allowances | (36,425) | (159,300)
Other adjustments | 24,057 | 39,103
Income tax expense (benefit) | $ 19,847 | $ 91,856

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