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Note 8 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Derivative assets $ 382 $ 113
Embedded customer derivatives   113
Liabilities:    
Embedded customer derivatives 382  
Total liabilities recorded at fair value 387 149
Metal Swaps [Member]    
Assets:    
Derivative assets 382  
Liabilities:    
Derivative liabilities   113
Interest Rate Swap [Member]    
Liabilities:    
Derivative liabilities 5 36
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Derivative assets
Embedded customer derivatives  
Liabilities:    
Embedded customer derivatives  
Total liabilities recorded at fair value
Fair Value, Inputs, Level 1 [Member] | Metal Swaps [Member]    
Assets:    
Derivative assets  
Liabilities:    
Derivative liabilities  
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]    
Liabilities:    
Derivative liabilities
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Derivative assets 382 113
Embedded customer derivatives   113
Liabilities:    
Embedded customer derivatives 382  
Total liabilities recorded at fair value 387 149
Fair Value, Inputs, Level 2 [Member] | Metal Swaps [Member]    
Assets:    
Derivative assets 382  
Liabilities:    
Derivative liabilities   113
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Liabilities:    
Derivative liabilities 5 36
Fair Value, Inputs, Level 3 [Member]    
Assets:    
Derivative assets
Embedded customer derivatives  
Liabilities:    
Embedded customer derivatives  
Total liabilities recorded at fair value
Fair Value, Inputs, Level 3 [Member] | Metal Swaps [Member]    
Assets:    
Derivative assets  
Liabilities:    
Derivative liabilities  
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]    
Liabilities:    
Derivative liabilities