Note 5 - Debt (Details) (USD $) | 9 Months Ended | | 9 Months Ended | | 1 Months Ended | | | | 9 Months Ended | | 9 Months Ended | | 0 Months Ended | 9 Months Ended | |
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 | Jun. 30, 2013 | Jul. 31, 2011 | Sep. 30, 2014 | Jun. 30, 2012 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Apr. 01, 2014 | Sep. 30, 2014 | Sep. 30, 2014 |
Availability Dollar Amount [Member] | Term Loan [Member] | Industrial Revenue Bond [Member] | Industrial Revenue Bond [Member] | Term Loan [Member] | Term Loan [Member] | Interest Rate Swap [Member] | Asset-Based Revolving Credit Facility Due June 30, 2016 [Member] | Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | Amortized Banking Fees [Member] | Amortized Banking Fees [Member] | Minimum [Member] | Maximum [Member] | ABL Credit Facility [Member] | ABL Credit Facility [Member] | Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] |
Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Chicago Tube and Iron Company Acquisition [Member] | Chicago Tube and Iron Company Acquisition [Member] | London Interbank Offered Rate (LIBOR) [Member] | ABL Credit Facility [Member] | | ABL Credit Facility [Member] | Base Rate [Member] | Base Rate [Member] | London Interbank Offered Rate (LIBOR) [Member] | London Interbank Offered Rate (LIBOR) [Member] | ABL Credit Facility [Member] | ABL Credit Facility [Member] | | | | | | |
ABL Credit Facility [Member] | ABL Credit Facility [Member] | | | ABL Credit Facility [Member] | | | | Minimum [Member] | Maximum [Member] | Minimum [Member] | Maximum [Member] | | | | | | | | |
| | | | | | | | ABL Credit Facility [Member] | ABL Credit Facility [Member] | ABL Credit Facility [Member] | ABL Credit Facility [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 |
Debt Instrument, Basis Spread on Variable Rate | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 0.00% | 0.25% | 1.25% | 3.00% | ' | ' | ' | ' | ' | ' | ' | ' |
Line of Credit Facility, Remaining Borrowing Capacity | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 90,000,000 | ' |
Prepaid Expense and Other Assets, Current | 9,419,000 | 12,786,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 1,100,000 | 3,600,000 | ' | ' | ' | ' | ' |
Amortization Term, Deferred Financing Fees | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | '5 years | ' |
Long-term Line of Credit | ' | ' | ' | 53,200,000 | ' | ' | 53,200,000 | ' | 42,300,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
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% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |