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Note 8 - Short-Term Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure Text Block [Abstract] |
Schedule of Short-term Debt [Table Text Block] |
|  | 2014 |  |  | 2013 |
Overnight repurchase agreements with customers |  | $ | 137,251,670 |  |  | $ | 98,822,967 |
Federal funds purchased |  |  | 131,100,000 |  |  |  | 50,470,000 |
|  | $ | 268,351,670 |  |  | $ | 149,292,967 |
Schedule of Repurchase Agreements [Table Text Block] |
|  | 2014 |  |  | 2013 |
Average daily balance during the period |  | $ | 128,818,152 |  |  | $ | 123,543,416 |
Average daily interest rate during the period |  |  | 0.12 | % |  |  | 0.12 | %
Maximum month-end balance during the period |  | $ | 147,623,624 |  |  | $ | 146,075,177 |
Weighted average rate as of end of period |  |  | 0.13 | % |  |  | 0.13 | %
Securities underlying the agreements as of end of period: |  |  |  |  |  |  |  |
Carrying value |  | $ | 165,360,426 |  |  | $ | 143,262,002 |
Fair value |  |  | 165,360,426 |  |  |  | 143,262,002 |
|  | 2014 |  |  | 2013 |
Average daily balance during the period |  | $ | 33,876,815 |  |  | $ | 41,156,729 |
Average daily interest rate during the period |  |  | 0.40 | % |  |  | 0.40 | %
Maximum month-end balance during the period |  | $ | 131,100,000 |  |  | $ | 95,380,000 |
Weighted average rate as of end of period |  |  | 0.23 | % |  |  | 0.28 | %

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- Definition The entire disclosure for repurchase agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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