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Note 7 - Fair Value of Financial Instruments - Fair Value Measurements, Recorded (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Assets:    
Embedded customer derivative $ 53 $ 113
Total assets at fair value 53 113
Liabilities:    
Total liabilities recorded at fair value 70 149
Metals Swap [Member]    
Liabilities:    
Derivative asset 53  
Derivative liability   113
Interest Rate Swap [Member]    
Liabilities:    
Derivative liability 17 36
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Embedded customer derivative
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 2 [Member]    
Assets:    
Embedded customer derivative 53 113
Total assets at fair value 53 113
Liabilities:    
Total liabilities recorded at fair value 70 149
Fair Value, Inputs, Level 2 [Member] | Metals Swap [Member]    
Liabilities:    
Derivative asset 53  
Derivative liability   113
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Liabilities:    
Derivative liability 17 36
Fair Value, Inputs, Level 3 [Member]    
Assets:    
Embedded customer derivative
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