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Note 8 - Fair Value of Financial Instruments - Fair Value Measurements, Recorded (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets:    
Embedded customer derivatives $ 113 $ 384
Total assets at fair value 113 384
Liabilities:    
Total liabilities recorded at fair value 149 600
Metals Swap [Member]    
Liabilities:    
Derivative asset 113  
Derivative liability   384
Interest Rate Swap [Member]    
Liabilities:    
Derivative liability 36 102
Fixed Interest Rate Swap [Member]    
Liabilities:    
Derivative liability   114
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Embedded customer derivatives
Total assets at fair value
Liabilities:    
Total liabilities recorded at fair value
Fair Value, Inputs, Level 1 [Member] | Metals Swap [Member]    
Liabilities:    
Derivative asset  
Derivative liability  
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]    
Liabilities:    
Derivative liability
Fair Value, Inputs, Level 1 [Member] | Fixed Interest Rate Swap [Member]    
Liabilities:    
Derivative liability  
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Embedded customer derivatives 113 384
Total assets at fair value 113 384
Liabilities:    
Total liabilities recorded at fair value 149 600
Fair Value, Inputs, Level 2 [Member] | Metals Swap [Member]    
Liabilities:    
Derivative asset 113  
Derivative liability   384
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Liabilities:    
Derivative liability 36 102
Fair Value, Inputs, Level 2 [Member] | Fixed Interest Rate Swap [Member]    
Liabilities:    
Derivative liability   114
Fair Value, Inputs, Level 3 [Member]    
Assets:    
Embedded customer derivatives
Total assets at fair value
Liabilities:    
Total liabilities recorded at fair value
Fair Value, Inputs, Level 3 [Member] | Metals Swap [Member]    
Liabilities:    
Derivative asset  
Derivative liability  
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]    
Liabilities:    
Derivative liability
Fair Value, Inputs, Level 3 [Member] | Fixed Interest Rate Swap [Member]    
Liabilities:    
Derivative liability