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Note 6 - Fair Value Measurements, Recorded (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Metals Swap [Member]    
Liabilities    
Metals swaps
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]    
Liabilities    
Interest rate swap (CTI)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Interest Rate Swap [Member] | A B L Credit Facility [Member]    
Liabilities    
Interest rate swap (CTI)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total assets at fair value
Liabilities    
Total liabilities recorded at fair value
Fair Value, Inputs, Level 1 [Member]    
Assets    
Embedded customer derivative
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Metals Swap [Member]    
Liabilities    
Metals swaps $ 204 $ 384
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]    
Liabilities    
Interest rate swap (CTI) 82 102
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Interest Rate Swap [Member] | A B L Credit Facility [Member]    
Liabilities    
Interest rate swap (CTI)   114
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total assets at fair value 204 384
Liabilities    
Total liabilities recorded at fair value 323 600
Fair Value, Inputs, Level 2 [Member]    
Assets    
Embedded customer derivative $ 204 $ 384
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Metals Swap [Member]    
Liabilities    
Metals swaps
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]    
Liabilities    
Interest rate swap (CTI)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Interest Rate Swap [Member] | A B L Credit Facility [Member]    
Liabilities    
Interest rate swap (CTI)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total assets at fair value
Liabilities    
Total liabilities recorded at fair value
Fair Value, Inputs, Level 3 [Member]    
Assets    
Embedded customer derivative
Fair Value, Measurements, Recurring [Member] | Fixed Interest Rate Swap [Member] | A B L Credit Facility [Member]    
Liabilities    
Interest rate swap (CTI) $ 37  
Metals Swap [Member]    
Liabilities    
Metals swaps 204 $ 384
Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]    
Liabilities    
Interest rate swap (CTI) 82 102
Fixed Interest Rate Swap [Member] | A B L Credit Facility [Member]    
Liabilities    
Interest rate swap (CTI) 37 114
Embedded customer derivative 204 384
Total assets at fair value 204 384
Total liabilities recorded at fair value $ 323 $ 600