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Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Unused Lines of Credit (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Line of Credit Facility [Line Items] |  |
Unused lines of credit | $ 346,550,159 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity | $ 351,291,107 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Secured Debt [Member] |  |
Line of Credit Facility [Line Items] |  |
Unused lines of credit | 17,050,159 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 26,791,107 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember
Unsecured Debt [Member] |  |
Line of Credit Facility [Line Items] |  |
Unused lines of credit | $ 329,500,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | $ 324,500,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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