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Note 6 - Debt (Details Textual) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Apr. 02, 2016	Jul. 31, 2011	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2012
Prepaid Expense and Other Assets, Current			$ 6,197	$ 7,820
Debt Instrument, Interest Rate, Effective Percentage			2.40%	2.10%	2.40%
Derivative, Fixed Interest Rate						1.21%
Interest Paid			$ 4,300	$ 5,083	$ 5,793
Long-term Debt, Gross			$ 152,500	$ 211,200	$ 234,700
Industrial Revenue Bonds [Member]
Effectof Swap Interest Rate Agreement			3.46%
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			1.00%
Amortized Banking Fees [Member]
Prepaid Expense and Other Assets, Current			$ 2,000
Minimum [Member]
Derivative Premium Rate						1.25%
Maximum [Member]
Derivative Premium Rate						1.75%
A B L Credit Facility [Member]
Line of Credit Facility Covenant Terms EBITDA Ratio			1
Line of Credit Facility, Remaining Borrowing Capacity			$ 94,300
Debt Instrument, Periodic Payment, Principal	$ 900
A B L Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan Member [Member]
Long-term Line of Credit						$ 53,200
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
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] | Availability Dollar Amount [Member]
Line Of Credit Facility Covenant Terms Monetary			$ 30,000

X

- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

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-Publisher FASB
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-SubTopic 30
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

Amount of the required periodic payments applied to principal.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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The amount of cash paid for interest during the period.

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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- Definition

The minimum commitments or obligations by the company that would require the Company to maintain certain EBITDA ratios under the revolver commitments.

+ References

No definition available.

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The premium rate of a derivative instrument.

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Effectof swap interest rate agreement.

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- Definition

Under the revolver commitments, the required ratio of EBITDA minus certain capital expenditures and cash taxes paid to fixed charges.

+ References

No definition available.

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Line of credit facility covenant terms monetary.

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- Definition

The percentage of covenants applied to revolver commitments in a line of credit.

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No definition available.

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