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Note 7 - Derivative Instruments (Details Textual)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
USD ($)
Jun. 30, 2012
USD ($)
Derivative, Fixed Interest Rate     1.21%
Cash Flow Hedging [Member]      
Derivative, Fixed Interest Rate     1.21%
A B L Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan Member [Member]      
Long-term Line of Credit     $ 53.2
Minimum [Member]      
Derivative Premium Rate     1.25%
Minimum [Member] | Cash Flow Hedging [Member]      
Derivative Premium Rate     1.25%
Maximum [Member]      
Derivative Premium Rate     1.75%
Maximum [Member] | Cash Flow Hedging [Member]      
Derivative Premium Rate     1.75%
Nickel Swaps [Member] | Minimum [Member]      
Derivative, Remaining Maturity 30 days    
Nickel Swaps [Member] | Maximum [Member]      
Derivative, Remaining Maturity 150 days    
Cash Flow Metals Hedges [Member]      
Derivative, Number of Instruments Held 0 0  
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   $ 2.4