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Note 7 - Fair Value of Financial Instruments (Details) - Fair Value Measurements, Recorded (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets:    
Total assets at fair value $ 181 $ 614
Liabilities:    
Embedded customer derivatives 181 614
Total liabilities at fair value 1,059 1,603
Metals Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets:    
Metals swaps 181 614
Metals Swaps [Member]
    
Assets:    
Metals swaps 181 614
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
    
Liabilities:    
Interest rate swap 250 279
Interest Rate Swap [Member]
    
Liabilities:    
Interest rate swap 250 279
Fixed Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
    
Liabilities:    
Interest rate swap 628 710
Fixed Interest Rate Swap [Member]
    
Liabilities:    
Interest rate swap 628 710
Fair Value, Inputs, Level 2 [Member]
    
Assets:    
Total assets at fair value 181 614
Liabilities:    
Embedded customer derivatives 181 614
Total liabilities at fair value $ 1,059 $ 1,603