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Note 12 - Derivative Financial Instruments (Details) - Effect of Derivative Instruments on the Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Financial Derivatives:        
Financial Derivatives [1] $ (2,140) $ (328) $ (1,315) $ (2,122)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]        
Financial Derivatives:        
Financial Derivatives (1,753) (300) (882) (2,033)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]        
Financial Derivatives:        
Financial Derivatives $ (387) $ (28) $ (433) $ (89)
[1] Net gains and losses are recorded as part of "Net gain/loss from fair value adjustments" in the Consolidated Statements of Income.