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Note 6 - Interest Rate Swap Derivatives (Details Textual)
3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Interest Rate Swap [Member]    
Derivative, Number of Instruments Held 3  
Derivative, Notional Amount $ 250,000,000  
Unrealized Gain (Loss) on Derivatives $ (8,800,000)  
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer 1 year  
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred $ 0  
Derivative, Number of Instruments Held   0
Derivative, Notional Amount 99,600,000 $ 62,400,000
Derivative, Net Liability Position, Aggregate Fair Value 8,800,000  
Derivative Liability, Fair Value of Collateral $ 8,200,000