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Note 12 - Income Taxes - Components of Income Tax Expense (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Current    
Federal $ 834,327 $ 1,532,959
State 383,242 406,410
Current Income Tax Expense (Benefit), Total 1,217,569 1,939,369
Revaluation of deferred tax asset due to change in corporate tax rate 410,391
Deferred (111,360) (347,446)
Income Tax Expense (Benefit), Total $ 1,106,209 $ 2,002,314