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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Financial Derivatives:        
Financial Derivatives $ (2,133) $ (752) $ 825 $ (1,794)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]        
Financial Derivatives:        
Financial Derivatives (2,125) (719) 871 (1,733)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]        
Financial Derivatives:        
Financial Derivatives $ (8) $ (33) $ (46) $ (61)