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Note 9 - Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] |
|  | Total Carrying Amount in Consolidated Balance Sheet Dec. 31, 2018 |  | Quoted Prices in Active Markets for Identical Assets |  | Trading Gains and Losses |  | Total Changes in Fair Values Included in Current Period Earnings (Loss)
Trading securities |  | $ | - |  |  | $ | - |  |  | $ | 6,406 |  |  | $ | (132,191 | )
Securities available for sale |  |  | 86,845,386 |  |  |  | 86,845,386 |  |  |  | 739,589 |  |  |  | 116,796 |
|  |  |  |  |  |  |  |  |  | $ | 745,995 |  |  | $ | (15,395 | )

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