Note 11 - Share-based Compensation - Restricted Stock Units Activity (Details) - $ / shares	12 Months Ended
Dec. 30, 2017	Dec. 31, 2016
Vested (in shares)	(15,000)
Vested, weighted average grant date fair value (in dollars per share)	$ 2.33
Time-based Restricted Stock Units [Member]
Granted (in shares)	87,000	63,000
Granted, weighted average grant date fair value (in dollars per share)	$ 5.88	$ 5.98
Time-based Restricted Stock Units [Member] \| The 2007 and 2014 Plan [Member]
Outstanding non-vested (in shares)	197,734
Outstanding non-vested, weighted average grant date fair value (in dollars per share)	$ 7.33
Granted (in shares)	87,034
Granted, weighted average grant date fair value (in dollars per share)	$ 5.88
Vested (in shares)	(197,734)
Vested, weighted average grant date fair value (in dollars per share)	$ 7.33
Forfeited or expired (in shares)	0
Forfeited or expired, weighted average grant date fair value (in dollars per share)	$ 0
Outstanding non-vested (in shares)	87,034	197,734
Outstanding non-vested, weighted average grant date fair value (in dollars per share)	$ 5.88	$ 7.33
Time-based Restricted Stock Units [Member] \| The 2014 Plan [Member]
Outstanding non-vested (in shares)	87,034
Performance-based Restricted Stock Units [Member]
Granted (in shares)	200,000	200,000
Granted, weighted average grant date fair value (in dollars per share)	$ 4.85	$ 5.36
Outstanding non-vested (in shares)	400,000
Performance-based Restricted Stock Units [Member] \| The 2014 Plan [Member]
Outstanding non-vested (in shares)	200,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share)	$ 5.36
Granted (in shares)	200,000
Granted, weighted average grant date fair value (in dollars per share)	$ 4.85
Vested (in shares)	0
Vested, weighted average grant date fair value (in dollars per share)	$ 0
Forfeited or expired (in shares)	0
Forfeited or expired, weighted average grant date fair value (in dollars per share)	$ 0
Outstanding non-vested (in shares)	400,000	200,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share)	$ 5.11	$ 5.36
Restricted Stock Units (RSUs) [Member]
Outstanding non-vested (in shares)	398,000	209,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share)	$ 6.34	$ 7.10
Vested (in shares)	(198,000)	(74,000)
Vested, weighted average grant date fair value (in dollars per share)	$ 7.33	$ 5.56
Forfeited or expired (in shares)
Forfeited or expired, weighted average grant date fair value (in dollars per share)
Outstanding non-vested (in shares)	487,000	398,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share)	$ 5.24	$ 6.34

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

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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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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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
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-SubTopic 10
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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
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-Subparagraph (c)(2)(iii)(1)
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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
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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
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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.

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-Publisher FASB
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