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Note 5 - Derivative Instruments (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2012
Nickel Swaps [Member] | Minimum [Member]        
Derivative, Remaining Maturity   30 days    
Nickel Swaps [Member] | Maximum [Member]        
Derivative, Remaining Maturity   2 years    
Cash Flow Metals Hedges [Member] | Cost of Materials Sold [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 544   $ 1,600  
Minimum [Member] | Cash Flow Hedging [Member]        
Derivative Premium Rate       1.25%
Maximum [Member] | Cash Flow Hedging [Member]        
Derivative Premium Rate       1.75%
A B L Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan Member [Member]        
Long-term Line of Credit       $ 53,200
Cash Flow Hedging [Member]        
Derivative, Fixed Interest Rate       1.21%