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Income Taxes - Deferred tax asset and liability components (Details) - USD ($)
Feb. 28, 2019
Feb. 28, 2018
Deferred tax asset    
Inventory $ 74,000 $ 186,800
Allowance for accounts receivable 13,000 18,100
Accrued expenses and other 37,000 111,200
Research tax credits 208,000 208,300
Valuation allowance   (4,600)
Deferred tax asset - Long Term 332,000 396,400
Deferred tax liability    
Intangible asset amortization (25,000) (25,000)
Building and leasehold depreciation (346,000) (360,400)
Deferred tax liability - Long Term $ (371,000) $ (385,400)