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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)

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