Note 4 - Long-term Debt (Details Textual)		6 Months Ended
Feb. 14, 2012 USD ($)	Jun. 28, 2015 USD ($)
Senior Credit Facility [Member] \| Amended And Restated Credit Agreement [Member] \| Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Senior Credit Facility [Member] \| Amended And Restated Credit Agreement [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Senior Credit Facility [Member] \| Amended And Restated Credit Agreement [Member] \| Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Senior Credit Facility [Member] \| Amended And Restated Credit Agreement [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Senior Credit Facility [Member]
Long-term Line of Credit		$ 0
Line of Credit Facility, Remaining Borrowing Capacity		$ 95,800,000
Long-term Debt, Weighted Average Interest Rate		2.10%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.20%
Letter of Credit [Member]
Letters of Credit Outstanding, Amount		$ 4,200,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000
Fixed Charge Coverage Ratio after Amendment	1.25
Maximum Leverage Ratio after Amendment	2.5
Debt Instrument Covenants on Cash Dividend Payments and Repurchases of Common or Preferred Stock	$ 100,000,000
Debt Covenant Limit Used for Cash Dividends and Repurchases of Common or Preferred Stock		$ 36,300,000

The debt covenant limit used for cash dividends and repurchases of common or preferred stock.

No definition available.

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- Definition

Debt instrument covenants on cash dividend payments and repurchases of common or preferred stock.

+ References

No definition available.

+ Details

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- Definition

Fixed charge coverage ratio after amendment.

+ References

No definition available.

+ Details

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- Definition

Maximum leverage ratio after amendment.

+ References

No definition available.

+ Details

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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.

+ Details

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

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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

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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Weighted average interest rate of long-term debt outstanding.

+ References

No definition available.

+ Details

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