Note 15 - Employee Benefit Plans - Assumptions Used to Determine Net Periodic (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Foreign Plan [Member]
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	2.00%	2.70%	3.00%
Expected return on plan assets	2.30%	3.10%	4.00%
Rate of compensation	1.75%	2.00%	2.00%
Weighted average assumptions used to determine benefit obligations
Discount rate	2.20%	2.30%	3.40%
Rate of compensation	1.75%	2.00%	2.00%
Components of net periodic benefit cost
Service cost	$ 1,628	$ 1,032	$ 1,061
Interest cost	5,559	6,580	8,384
Amortizations	(34)	33	33
Net periodic benefit cost	$ 1,944	$ 1,168	$ 2,073
UNITED STATES
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	3.85%	4.25%	4.00%
Rate of compensation		4.00%	4.00%
Weighted average assumptions used to determine benefit obligations
Discount rate	3.50%	3.85%	4.25%
Rate of compensation		4.00%	4.00%
Components of net periodic benefit cost
Service cost	$ 0	$ 440	$ 594
Interest cost	1,256	1,269	1,113
Amortizations	364	811	522
Net periodic benefit cost	$ 1,620	$ 2,520	$ 2,229

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

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- References

No definition available.

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- References

No definition available.

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- References

No definition available.

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