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Note 6 - Interest Rate Swap Derivatives (Details Textual)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Interest Rate Swap [Member]          
Derivative, Number of Instruments Held 3   3    
Derivative, Notional Amount $ 250,000,000   $ 250,000,000    
Unrealized Gain (Loss) on Derivatives     $ (9,000,000)   $ (1,400,000)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer     1 year    
Reclassification out of Accumulated Other Comprehensive Income [Member]          
Interest Expense     $ 776,000    
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net     $ 0
Derivative, Notional Amount 250,000,000   250,000,000   $ 250,000,000
Interest Expense 7,703,000 $ 4,896,000 18,870,000 $ 14,503,000  
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred     2,600,000    
Derivative, Net Liability Position, Aggregate Fair Value 9,000,000   9,000,000    
Derivative Liability, Fair Value of Collateral $ 9,600,000   $ 9,600,000