Rendering

Component: (Network and Table)
Network
176 - Disclosure - Asset Retirement Obligations (Detail)
(http://www.ewst.com/role/AssetRetirementObligationsDetail)
TableStatement [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000043350 (http://www.sec.gov/CIK)
Class of Stock [Axis]Class of Stock [Domain]
Statement [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Balance
1,218,000  
1,197,000  
Accretion expense
0  
21,000  
Balance
1,218,000  
 
1,218,000