Represents the duration of the capital lease agreement.

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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-Publisher FASB
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments for capital leases.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of loss contingency liability.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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-Publisher FASB
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-SubTopic 20
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

Note 11 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Apr. 02, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2012	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Rent Expense, Net, Total		$ 400	$ 400
Accrual for Environmental Loss Contingencies, Ending Balance		0			$ 0
Indemnification Agreement [Member]
Loss Contingency Accrual, Ending Balance		0			0
Other Noncurrent Liabilities [Member]
Capital Lease Obligations, Total		$ 0			$ 0	$ 100
Assets Held under Capital Leases [Member]
Capital Lease Agreement Period				6 years
Software Licensing Agreement [Member] \| Subsequent Event [Member]
Capital Lease Agreement Period	5 years
Capital Leases, Future Minimum Payments Due, Total	$ 600