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Stockholders' Equity (Details) (USD $)
0 Months Ended
Aug. 15, 2014
Three Independent Directors [Member]  
Stockholders' Equity (Textual)  
Common stock shares issued to independent directors 2,055us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_TitleOfIndividualAxis
= evk_ThreeIndependentDirectorsMember
Common stock issued at five days average market price $ 4.91us-gaap_SaleOfStockPricePerShare
/ us-gaap_TitleOfIndividualAxis
= evk_ThreeIndependentDirectorsMember
Number of days used to calculation average market price of common stock five days before the grant date.
Two Independence Directors [Member]  
Stockholders' Equity (Textual)  
Common stock shares issued to independent directors 798us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_TitleOfIndividualAxis
= evk_TwoIndependenceDirectorsMember
Common stock issued at five days average market price $ 6.22us-gaap_SaleOfStockPricePerShare
/ us-gaap_TitleOfIndividualAxis
= evk_TwoIndependenceDirectorsMember
Number of days used to calculation average market price of common stock five days before the grant date.