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Note 5 - Premises and Equipment (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Leases, Rent Expense | $ 348,467 | $ 334,977 | $ 339,839
General Contractor [Member] | Estimated Full Contract Price to Complete Remodel [Member] |  |  |
Related Party Transaction, Amounts of Transaction |  | 3,700,000 |
Due to Related Parties |  | $ 2,200,000 |

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