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Note 6 - Interest Rate Swap Derivatives (Details Textual)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Derivative, Notional Amount $ 250,000 $ 250,000 $ 250,000   $ 250,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     (578)   (2,255)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net     463   (692)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net     (1)   $ 1
Interest Rate Swap [Member]          
Derivative, Number of Instruments Held         3
Derivative, Notional Amount         $ 250,000
Unrealized Gain (Loss) on Derivatives     463   (692)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     $ 578    
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     $ 1,200    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 463        
Derivative Liability 463 463 463   $ 692
Derivative Liability, Fair Value of Collateral 0 0 0    
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net       $ 0  
Cancelable Interest Rate Swap [Member]          
Derivative, Notional Amount 8,000 8,000 8,000    
Gain (Loss) on Derivative Instruments, Net, Pretax   (29)      
Derivative Liability $ 29 $ 29 $ 29