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Note 9 - Credit Agreements (Details Textual) $ in Thousands				1 Months Ended		3 Months Ended		5 Months Ended	9 Months Ended
		Apr. 30, 2017	Jul. 01, 2016	Oct. 31, 2017 USD ($)	May 31, 2015 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	May 31, 2013 USD ($)
Gain Loss on Change in Cash Flows Related to Debt	[1]						$ (2,957)			$ (2,957)
Short-term Debt						26,226		$ 26,226	26,226			$ 31,198
ABL Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 250,000
Proceeds from Lines of Credit					$ 100,000
Long-term Line of Credit						100,000		100,000	100,000
Line of Credit Facility, Remaining Borrowing Capacity						$ 142,220		$ 142,220	$ 142,220
ABL Revolving Credit Facility [Member] | Subsequent Event [Member]
Repayments of Long-term Lines of Credit				$ 90,000
Base Rate [Member] | ABL Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate									0.50%
Adjusted LIBOR Rate [Member] | ABL Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate									1.50%
Term Loan [Member]
Line of Credit Facility, Maximum Borrowing Capacity													$ 1,200,000
Uncommitted Incremental Term Loan Facility													$ 300,000
Net Debt Leverage Ratio Threshold		3
Net Debt Leverage Ratio Not Achieved			3				3			3
Gain Loss on Change in Cash Flows Related to Debt							$ 2,957
Debt Issuance Costs, Net											$ 1,432
Debt Instrument, Fee Amount											$ 85
Term Loan [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		1.75%						1.25%
Term Loan [Member] | Base Rate [Member] | Net Debt Leverage Ratio Threshold [Member]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Term Loan [Member] | Adjusted LIBOR Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		2.75%						2.25%
Term Loan [Member] | Adjusted LIBOR Rate [Member] | Net Debt Leverage Ratio Threshold [Member]
Debt Instrument, Basis Spread on Variable Rate		2.50%
Term Loan [Member] | LIBOR Floor Rate [Member]
Debt Instrument, Basis Spread on Variable Rate								0.75%	0.75%
[1] For the three and nine month periods ended September 30, 2016, represents a non-cash loss relating to the continued 25 basis point increase in borrowing costs as a result of the credit agreement leverage ratio remaining above 3.0 times based on projections at that time.

X

- Definition

Gain (loss)on change in cash flows related to debt during the period.

+ References

No definition available.

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- Definition

Represents net debt leverage ratio that the borrower has not achieved (the borrower's actual net debt leverage ratio is above this target).

+ References

No definition available.

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Threshold of the ratio used to calculate the financial leverage and the ability to meet financial obligations. If the borrower's actual net debt leverage ratio falls below this threshold for a certain measurement period, the applicable margin related to LIBOR rate loans can be reduced by a specified percentage.

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Refers to uncommitted incremental term loan facility after amendment.

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No definition available.

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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 of the fee that accompanies borrowing money under the debt instrument.

+ 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(b))
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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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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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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- Definition

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 cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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