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Note 10 - Interest Rate Swap Derivatives (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Note 10 - Interest Rate Swap Derivatives (Details) [Line Items]    
Derivative, Number of Instruments Held   0
Derivative, Notional Amount $ 39,600,000 $ 45,100,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0  
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 1,800,000  
Derivative, Net Liability Position, Aggregate Fair Value 1,400,000  
Derivative Liability, Fair Value of Collateral $ 2,900,000  
Interest Rate Swap [Member]    
Note 10 - Interest Rate Swap Derivatives (Details) [Line Items]    
Derivative, Number of Instruments Held 3  
Derivative, Notional Amount $ 250,000,000  
Unrealized Gain (Loss) on Derivatives $ (1,400,000)  
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer 12 years