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Note 8 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Excess of tax over financial accounting $ 624,154 $ 0
Vacation accrual 1,971 3,908
Reserve for excess and obsolete inventory 151,288 152,680
Business tax credit carryover 0 30,935
Deferred compensation 49,556 17,943
Net operating loss carryover 7,627,046 5,889,088
Excess of book over tax depreciation (610,694) (300,805)
Excess of book over tax work in progress (817,131) (847,290)
Valuation allowance (7,331,357) (5,285,222)
Deferred Tax Liabilities, Net, Total (305,167) (338,763)
Long-term deferred tax asset 0 0
Long-term deferred tax liability (305,167) (338,763)
Deferred Income Tax Liabilities, Net, Total $ (305,167) $ (338,763)