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Note 4 - Share-based Compensation - Summary of Performance Shares (Details) - Performance Shares [Member] - shares	Jul. 01, 2017	Dec. 31, 2016
Performance shares (in shares)	289,615	241,141
Vesting Subject to Time-based Restrictions [Member]
Performance shares (in shares)	6,325
Vesting Upon Achievement of 2015-2017 Consolidated Revenues Target [Member]
Performance shares (in shares)	50,000
Vesting Upon Achievement of 2016-2018 Consolidated Revenues Target [Member]
Performance shares (in shares)	149,393
Vesting Upon Achievement of 2017-2019 Consolidated Pre-tax Income Target [Member]
Performance shares (in shares)	83,897

X

- Definition

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.

+ 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)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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