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Note 9 - Income Taxes - Provision for Income Taxes (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income (loss) before taxes $ 413,379 $ (717,246)
Income tax expense (benefit) on above amount at federal statutory rate 86,800 (150,600)
State income tax expense (benefit), net of federal benefit 20,700 (35,900)
Permanent differences 7,400 2,900
Other (1,000) (1,300)
NOL Expirations 66,600 1,302,000
Change in valuation allowance (180,500) (1,117,100)
Provision for income taxes