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Note 6 - Securities Sold Under Agreements to Repurchase (Tables) | 3 Months Ended
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Mar. 31, 2016
Disclosure Text Block [Abstract] |
Schedule of Repurchase Agreements [Table Text Block] |
|  | Three Months Ended |  |  | Twelve Months Ended |
|  | March 31, 2016 |  |  | December 31, 2015 |
Outstanding balance at end of period |  | $ | 162,312,000 |  |  | $ | 154,771,000 |
Average interest rate at end of period |  |  | 0.11 | % |  |  | 0.11 | %
Average daily balance during the period |  | $ | 158,281,000 |  |  | $ | 146,826,000 |
Average interest rate during the period |  |  | 0.11 | % |  |  | 0.11 | %
Maximum daily balance during the period |  | $ | 175,088,000 |  |  | $ | 168,211,000 |

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- Definition The entire disclosure for repurchase agreements. + References Reference 1: 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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