Note 5 - Debt (Details) (USD $)	6 Months Ended		6 Months Ended		1 Months Ended				6 Months Ended		6 Months Ended							0 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Availability Dollar Amount [Member] Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] ABL Credit Facility [Member]	Jun. 30, 2013 Term Loan [Member] London Interbank Offered Rate (LIBOR) [Member] ABL Credit Facility [Member]	Jul. 31, 2011 Industrial Revenue Bond [Member] Chicago Tube and Iron Company Acquisition [Member]	Jun. 30, 2014 Industrial Revenue Bond [Member] Chicago Tube and Iron Company Acquisition [Member]	Jun. 30, 2012 Term Loan [Member] London Interbank Offered Rate (LIBOR) [Member] ABL Credit Facility [Member]	Jun. 30, 2014 Term Loan [Member] ABL Credit Facility [Member]	Jun. 30, 2014 Interest Rate Swap [Member]	Jun. 30, 2014 Asset-Based Revolving Credit Facility Due June 30, 2016 [Member] ABL Credit Facility [Member]	Jun. 30, 2014 Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] Base Rate [Member] Minimum [Member] ABL Credit Facility [Member]	Jun. 30, 2014 Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] Base Rate [Member] Maximum [Member] ABL Credit Facility [Member]	Jun. 30, 2014 Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum [Member] ABL Credit Facility [Member]	Jun. 30, 2014 Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member] ABL Credit Facility [Member]	Jun. 30, 2014 Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] ABL Credit Facility [Member]	Jun. 30, 2014 Amortized Banking Fees [Member] ABL Credit Facility [Member]	Jun. 30, 2014 Amortized Banking Fees [Member]	Apr. 01, 2014 ABL Credit Facility [Member]	Jun. 30, 2014 ABL Credit Facility [Member]	Jun. 30, 2014 Asset-Based Revolving Credit Facility Due June 30, 2019 [Member]	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Maximum [Member]
Note 5 - Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity										$ 315,000,000					$ 365,000,000
Other Long-term Debt								44,500,000
Line of Credit Facility, Current Borrowing Capacity															365,000,000
Line of Credit Facility Covenant Terms Monetary			30,000,000
Line of Credit Facility, Covenant Terms, Percentage of Revolver Commitments															10.00%
Balance Required for Compliance with Revolver Commitments															36,500,000
Line of Credit Facility Covenant Terms EBITDA Ratio																				1.00%
Debt Instrument, Basis Spread on Variable Rate											0.00%	0.25%	1.25%	3.00%
Line of Credit Facility, Remaining Borrowing Capacity																			126,000,000
Prepaid Expense and Other Assets, Current	9,880,000	12,786,000														1,000,000	3,700,000
Amortization Term, Deferred Financing Fees																			5 years
Long-term Line of Credit				53,200,000			53,200,000		44,500,000
Fixed Rate Interest Hedge, Notional Monthly Decrease									729,000
Derivative, Fixed Interest Rate	1.21%
Derivative Premium Rate																					1.75%	2.25%
Business Combination, Consideration Transferred, Liabilities Incurred					5,900,000
Debt Instrument, Periodic Payment, Principal																		$ 810,000
Debt Instrument, Interest Rate, Effective Percentage						0.15%
Effect of Swap Interest Rate Agreement	3.46%