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Note 4 - Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2013
Asset Based Revolving Credit Facility Due June 30, 2019 [Member] | A B L Credit Facility [Member] | Availability Dollar Amount [Member]        
Line Of Credit Facility Covenant Terms Monetary   $ 30,000    
Asset Based Revolving Credit Facility Due June 30, 2019 [Member] | A B L Credit Facility [Member] | Minimum [Member] | Base Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.00%    
Asset Based Revolving Credit Facility Due June 30, 2019 [Member] | A B L Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.25%    
Asset Based Revolving Credit Facility Due June 30, 2019 [Member] | A B L Credit Facility [Member] | Maximum [Member] | Base Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.25%    
Asset Based Revolving Credit Facility Due June 30, 2019 [Member] | A B L Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   3.00%    
Asset Based Revolving Credit Facility Due June 30, 2019 [Member] | A B L Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 365,000    
Line of Credit Facility, Current Borrowing Capacity   $ 365,000    
Line of Credit Facility Covenant Terms Percentage of Revolver Commitments   10.00%    
Balance Required for Compliance with Revolver Commitments   $ 36,500    
A B L Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan Member [Member]        
Long-term Line of Credit       $ 53,200
A B L Credit Facility [Member]        
Line of Credit Facility Covenant Terms EBITDA Ratio   1    
Line of Credit Facility, Remaining Borrowing Capacity   $ 93,000    
Debt Instrument, Periodic Payment, Principal $ 865      
Minimum [Member]        
Derivative Premium Rate   1.25%    
Maximum [Member]        
Derivative Premium Rate   1.75%    
Amortized Banking Fees [Member]        
Prepaid Expense and Other Assets, Current   $ 2,600    
Industrial Revenue Bonds [Member] | Chicago Tube and Iron Company Acquisition [Member]        
Business Combination, Consideration Transferred, Liabilities Incurred   $ 5,900    
Debt Instrument, Interest Rate, Effective Percentage   0.60%    
Industrial Revenue Bonds [Member]        
Effectof Swap Interest Rate Agreement   3.46%    
Interest Rate Swap [Member]        
Long-term Line of Credit   $ 28,400    
Fixed Rate Interest Hedge Notional Monthly Decrease   729    
Prepaid Expense and Other Assets, Current   $ 7,847 $ 7,820  
Derivative, Fixed Interest Rate   1.21%