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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Accounts receivable, allowance for doubtful accounts $ 250us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 221us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Other assets    
Non-utility property, accumulated depreciation $ 468us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 389us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment