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Note 10 - Interest Rate Swap Derivatives (Details Textual)
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Derivative, Notional Amount $ 250,000,000 $ 250,000,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (2,255,000)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 1,000
Interest Rate Swap [Member]    
Derivative, Number of Instruments Held 3  
Derivative, Notional Amount $ 250,000,000  
Unrealized Gain (Loss) on Derivatives (692,000) (1,400,000)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 2,300,000 0
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 $ 1,900,000  
Derivative, Net Liability Position, Aggregate Fair Value 692,000 1,400,000
Derivative Liability, Fair Value of Collateral $ 550,000 2,900,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net   $ 0