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Commitments and Contingencies (Details Textual)	3 Months Ended	6 Months Ended
	Jul. 01, 2016 USD ($)	Jul. 01, 2016 USD ($)	Jul. 01, 2016 JPY (¥)	Jan. 01, 2016 USD ($)	May 01, 2015 CHF (SFr)	May 01, 2015 EUR (€)	Dec. 28, 2012 JPY (¥)	Aug. 31, 2010 CHF (SFr)
Loss Contingencies [Line Items]
Line Of Credit, Current	$ 4,866,000	$ 4,866,000		$ 4,159,000
Bankinter [Member]
Loss Contingencies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	222,000	222,000				€ 200,000
Line of Credit Facility, Current Borrowing Capacity	$ 803,000	803,000			SFr 783,000
Debt Instrument, Maturity Date	May 01, 2017
Mizuho Bank [Member]
Loss Contingencies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 4,900,000	4,900,000					¥ 500,000,000
Line Of Credit, Current	$ 4,900,000	$ 4,900,000	¥ 500,000,000	$ 4,200,000
Line of Credit Facility, Expiration Date		Sep. 30, 2016
Mizuho Bank [Member] | Prime Rate [Member]
Loss Contingencies [Line Items]
Line of Credit Facility, Interest Rate at Period End	1.475%	1.475%	1.475%
Credit Suisse [Member]
Loss Contingencies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000,000	$ 1,000,000						SFr 1,000,000
Commission On Outstanding Borrowings, Percentage		0.25%

X

- Definition

The percentage of commission on average outstanding borrowings during the period.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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- Definition

The effective interest rate at the end of the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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X

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Line-of-Credit Arrangement
-URI http://asc.fasb.org/extlink&oid=6517033

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-Name Accounting Standards Codification
-Topic 210
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No definition available.

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