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Note 11 - Stock Incentive Plans - Activity for Time-based and Performance-based Restricted Stock (Details) - $ / shares	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Restricted Stock [Member]
Outstanding (in shares)	316,116	276,553	419,674
Outstanding, weighted average grant date fair value (in dollars per share)	$ 13.30	$ 11.93	$ 7.64
Granted (in shares)	258,060	203,613	107,004
Granted, weighted average grant date fair value (in dollars per share)	$ 9.18	$ 13.58	$ 19.59
Vested (in shares)	(179,132)	(152,548)	(205,137)
Vested, weighted average grant date fair value (in dollars per share)	$ 12.20	$ 11.22	$ 7.84
Forfeited (in shares)	(33,505)	(11,502)	(44,988)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 12.55	$ 13.45	$ 8.89
Canceled (in shares)
Canceled, weighted average grant date fair value (in dollars per share)
Outstanding (in shares)	361,539	316,116	276,553
Outstanding, weighted average grant date fair value (in dollars per share)	$ 10.97	$ 13.30	$ 11.93
Performance Shares [Member]
Outstanding (in shares)	241,141	84,062
Outstanding, weighted average grant date fair value (in dollars per share)	$ 15.39	$ 20.70
Granted (in shares)	83,897	176,611	86,222
Granted, weighted average grant date fair value (in dollars per share)	$ 8.85	$ 13.68	$ 20.71
Vested (in shares)	(6,472)	(7,039)
Vested, weighted average grant date fair value (in dollars per share)	$ 20.54	$ 20.56
Forfeited (in shares)	(15,247)		(2,160)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 14.28		$ 20.80
Canceled (in shares)	(13,704)	(12,493)
Canceled, weighted average grant date fair value (in dollars per share)	$ 13.68	$ 20.56
Outstanding (in shares)	289,615	241,141	84,062
Outstanding, weighted average grant date fair value (in dollars per share)	$ 13.66	$ 15.39	$ 20.70

X

- Definition

The number of canceled or expired shares during the period on the other than stock or unit option plans.

+ References

No definition available.

+ Details

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X

- Definition

The weighted average fair value grant date for shares canceled or expired shares during the period on the other than stock or unit option plans.

+ References

No definition available.

+ Details

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X

- Definition

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)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

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).

+ 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)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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).

+ 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)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

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X

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ 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

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X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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

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