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Note 4 - Debt (Details Textual) - USD ($) $ in Thousands		1 Months Ended	6 Months Ended
	Apr. 02, 2016	Jul. 31, 2011	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2012
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			$ 105,000
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			$ 2,500
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			0.70%
Industrial Revenue Bonds [Member]
Effectof Swap Interest Rate Agreement			3.46%
Prepaid Expense and Other Assets, Current			$ 7,237	$ 7,820
Derivative, Fixed Interest Rate					1.21%

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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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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- 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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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.

+ References

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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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- Definition

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.

+ References

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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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- Definition

The premium rate of a derivative instrument.

+ References

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- Definition

Effectof swap interest rate agreement.

+ References

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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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- Definition

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

+ References

No definition available.

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