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Note 9 - Retail Repurchase Agreements (Details) - Borrowings Under Repurchase Agreements - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Borrowings Under Repurchase Agreements [Abstract]    
Outstanding balance at year end $ 0 $ 9,310
Weighted average interest rate at year end 0.00% 0.26%
Weighted average interest rate during the year 0.26% 0.25%
Average daily balance $ 4,601 $ 11,015
Maximum month-end balance during the year 10,617 13,041
Debt securities underlying the agreements at December 31:    
Amortized cost 0 13,322
Fair value $ 0 $ 12,920