Concentrations and Risks.

No definition available.

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- Definition

Number of manufacturers that supply major part of finished goods.

+ References

No definition available.

+ Details

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Namespace Prefix:	evk_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Number of raw material supplier.

+ References

No definition available.

+ Details

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Namespace Prefix:	evk_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Number of suppliers.

+ References

No definition available.

+ Details

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Namespace Prefix:	evk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of wholesale customer that hold major part of company's revenue.

+ References

No definition available.

+ Details

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Namespace Prefix:	evk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Details

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- Details

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- Details

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Concentrations and Risks (Details Textual) $ in Thousands	3 Months Ended
Concentrations and Risks (Details Textual) $ in Thousands	Mar. 31, 2016 USD ($) WholesaleCustomer RawMaterialSuppliers Manufacturer Supplier	Mar. 31, 2015 WholesaleCustomer RawMaterialSuppliers Manufacturer Supplier	Dec. 31, 2015 USD ($)
Concentrations and Risks (Textual)
Allowance for doubtful accounts \| $	$ 1,710		$ 2,180
Revenues [Member]
Concentrations and Risks (Textual)
Number of wholesale customer \| WholesaleCustomer	1	2
Wholesale Customer One [Member] \| Revenues [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage	11.00%	15.00%
Wholesale Customer Two [Member] \| Revenues [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage		14.00%
Wholesale Business [Member] \| Raw Materials [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage	10.00%	10.00%
Number of raw material supplier	1	1
Wholesale Business [Member] \| Finished Goods [Member]
Concentrations and Risks (Textual)
Number of manufacturers \| Manufacturer	3	3
Wholesale Business [Member] \| Finished Goods [Member] \| Manufacturer One [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage	18.00%	11.00%
Wholesale Business [Member] \| Finished Goods [Member] \| Manufacturer Two [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage	16.00%	10.00%
Wholesale Business [Member] \| Finished Goods [Member] \| Manufacturer Three [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage	11.00%	10.00%
Retail Business [Member] \| Raw Materials [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage	13.00%	12.00%
Number of raw material supplier	1	1
Retail Business [Member] \| Finished Goods [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage	10.00%	10.00%
Number of suppliers \| Supplier	1	1