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Note 11 - Fair Value of Financial Instruments (Details) - Financial Assets and Liabilities Reported Under the Fair Value Option - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value Measurements $ 32,200   $ 32,200   $ 32,600
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option 768 $ (402) 173 $ (1,046)  
Collateralized Mortgage Backed Securities [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value Measurements 4,037   4,037   4,678
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option (28) 24 (36) 72  
Other Securities [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value Measurements 28,122   28,122   27,915
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option (108) 172 89 497  
Borrowed Funds [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value Measurements 29,476   29,476   $ 28,771
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option (1,229) 154 (705) 179  
Financial Assets And Liabilities, Excluding Interest Rate Caps / Swaps [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option [1],[2] $ (1,365) $ 350 $ (652) $ 748  
[1] The net gain (loss) from fair value adjustments presented in the above table does not include net gains (losses) of $0.8 million and ($1.8) million for the six months ended June 30, 2015 and 2014, respectively, from the change in the fair value of interest rate swaps.
[2] The net gain (loss) from fair value adjustments presented in the above table does not include net gains (losses) of $2.1 million and ($0.8) million for the three months ended June 30, 2015 and 2014, respectively, from the change in the fair value of interest rate swaps.