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Note 5 - Loans - Modified in a Troubled Debt Restructuring (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of contracts | 0 |  | 2
Pre-modification |  |  | $ 446,064
Post-modification |  |  | $ 445,881
Real Estate Portfolio Segment [Member] | Commercial [Member] |  |  |
Number of contracts | 1 |  | 1
Pre-modification | $ 402,430 |  | $ 91,280
Post-modification | $ 402,430 |  | $ 91,097
Real Estate Portfolio Segment [Member] | Residential [Member] |  |  |
Number of contracts |  |  | 1
Pre-modification |  |  | $ 354,784
Post-modification |  |  | $ 354,784

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