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Note 17 - Fair Values of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | Level in |  |  | 2015 |  |  | 2014 |
|  | Fair Value |  |  | Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
|  | Hierarchy |  |  | Amount |  |  | Value |  |  | Amount |  |  | Value |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | Level 1 |  |  | $ | 12,496 |  |  | $ | 12,496 |  |  | $ | 13,261 |  |  | $ | 13,261 |
Cash equivalents |  | Level 2 |  |  |  | 77,395 |  |  |  | 77,395 |  |  |  | 159,477 |  |  |  | 159,477 |
Securities available for sale |  | (1) |  |  |  | 346,992 |  |  |  | 346,992 |  |  |  | 432,912 |  |  |  | 432,912 |
Federal Home Loan Bank stock |  | (2) |  |  |  | 7,567 |  |  |  | 7,567 |  |  |  | 13,699 |  |  |  | 13,699 |
Loans, net |  | Level 3 |  |  |  | 2,262,046 |  |  |  | 2,261,026 |  |  |  | 2,069,236 |  |  |  | 2,064,140 |
Bank owned life insurance |  | Level 2 |  |  |  | 58,971 |  |  |  | 58,971 |  |  |  | 57,861 |  |  |  | 57,861 |
Accrued interest receivable |  | Level 2 |  |  |  | 7,836 |  |  |  | 7,836 |  |  |  | 8,033 |  |  |  | 8,033 |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | Level 2 |  |  |  | 2,275,382 |  |  |  | 2,208,724 |  |  |  | 2,276,915 |  |  |  | 2,254,749 |
Securities sold under agreements to repurchase |  | Level 2 |  |  |  | 154,771 |  |  |  | 154,771 |  |  |  | 167,569 |  |  |  | 167,569 |
Federal Home Loan Bank advances |  | Level 2 |  |  |  | 68,000 |  |  |  | 68,858 |  |  |  | 54,022 |  |  |  | 54,720 |
Subordinated debentures |  | Level 2 |  |  |  | 55,154 |  |  |  | 55,760 |  |  |  | 54,472 |  |  |  | 54,508 |
Accrued interest payable |  | Level 2 |  |  |  | 1,479 |  |  |  | 1,479 |  |  |  | 1,942 |  |  |  | 1,942 |
Interest rate swap |  | (1) |  |  |  | 253 |  |  |  | 253 |  |  |  | 253 |  |  |  | 253 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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