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Note 8. Short-Term Borrowings (Details) - Overnight Repurchase Agreements - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Repurchase Agreements with Customers [Member] |  |
Note 8. Short-Term Borrowings (Details) - Overnight Repurchase Agreements [Line Items] |  |
Average daily balance during the period | $ 121,186,231 | $ 128,818,152
Average daily interest rate during the period | 0.11% | 0.12%
Maximum month-end balance during the period | $ 159,407,193 | $ 147,623,624
Weighted average rate as of end of period | 0.11% | 0.11%
Federal Funds Purchased [Member] |  |
Note 8. Short-Term Borrowings (Details) - Overnight Repurchase Agreements [Line Items] |  |
Average daily balance during the period | $ 32,826,489 | $ 33,876,815
Average daily interest rate during the period | 0.41% | 0.40%
Maximum month-end balance during the period | $ 126,220,000 | $ 131,100,000
Weighted average rate as of end of period | 0.57% | 0.51%

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- Details
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