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Note 7 - Fair Value of Financial Instruments (Detail) - Fair Value Measurements, Recorded (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets:    
Embedded customer derivatives $ 144 $ 113
Total assets at fair value 144 113
Liabilities:    
Nickel swaps 199 168
Total liabilities at fair value 1,536 1,555
Fixed Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
    
Liabilities:    
Interest rate swap 937  
Fixed Interest Rate Swap [Member]
    
Liabilities:    
Interest rate swap 937  
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
    
Liabilities:    
Interest rate swap 404 446
Interest Rate Swap [Member]
    
Liabilities:    
Interest rate swap 404 446
Fixed Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
    
Liabilities:    
Interest rate swap   941
Fixed Interest Rate Swap [Member]
    
Liabilities:    
Interest rate swap   941
Fair Value, Inputs, Level 2 [Member]
    
Assets:    
Embedded customer derivatives 144 113
Total assets at fair value 144 113
Liabilities:    
Nickel swaps 199 168
Total liabilities at fair value $ 1,536 $ 1,555