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Note 5 - Stock-based Compensation (Details) - Summary of the Balance and Activity for the Plans Related to Stock Options	9 Months Ended
	Sep. 27, 2014
Restricted Stock [Member]
Note 5 - Stock-based Compensation (Details) - Summary of the Balance and Activity for the Plans Related to Stock Options [Line Items]
Outstanding, December 28, 2013	720,198
Granted	201,458
Vested	343,473
Forfeited	116,763
Outstanding, September 27, 2014	461,420
Employee Stock Option [Member]
Note 5 - Stock-based Compensation (Details) - Summary of the Balance and Activity for the Plans Related to Stock Options [Line Items]
Outstanding, December 28, 2013	1,065,012
Granted	103,776
Exercised	322,427
Forfeited	6,750
Canceled or expired	80,862
Outstanding, September 27, 2014	758,749

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Number of share options (or share units) exercised during the current period.

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-Publisher SEC

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-Number 210

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