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Note 8 - Repurchase Agreements (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Securities Loaned or Sold under Agreements to Repurchase [Member]      
Repayments of Long-term Debt $ 38,000,000    
Debt, Average Cost, Percentage 4.16    
Payments of Debt Extinguishment Costs 2,100,000    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 44,100,000   $ 131,400,000
Repayments of Long-term Debt $ 260,301,000 $ 90,000,000