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Note 12 - Effect of Derivative Instruments on Consolidated Statements of Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]    
Net gain (loss) $ (2,102) $ (1,254)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]    
Net gain (loss) (40) (54)
Net gain (loss) [1] $ (2,142) $ (1,308)
[1] Net gains and losses are recorded as part of “Net gain/loss from fair value adjustments” in the Consolidated Statements of Income.