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Note 10 - Income Taxes - Components of Income Tax (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current Federal Expense |  | $ 2,727,094 | $ 3,943,495 | $ 3,629,213
Deferred Federal Expense |  | 273,176 | 793,012 | 222,120
Deferred Tax Expense from Tax Rate Changes | $ 2,040,946 |  | 2,040,946 |
Federal Income Tax Expense |  | 3,000,270 | 6,777,453 | 3,851,333
Current State Income Tax Expense |  |  |  |
Federal and State Income Tax Expense |  | $ 3,000,270 | $ 6,777,453 | $ 3,851,333

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