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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
Line of Credit Facility [Line Items]    
Unused lines of credit $ 346,550,159us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity $ 351,291,107us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Secured Debt [Member]    
Line of Credit Facility [Line Items]    
Unused lines of credit 17,050,159us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 26,791,107us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Unsecured Debt [Member]    
Line of Credit Facility [Line Items]    
Unused lines of credit $ 329,500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		 $ 324,500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember