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Regulatory Matters: (Details 5) (GSWC, USD $)
 1 Months Ended 6 Months Ended 1 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Mar. 31, 2013
BVES General Rate Case
Aug. 31, 2012
BVES General Rate Case
Mar. 31, 2012
BVES General Rate Case
Jun. 30, 2013
BVES General Rate Case
Dec. 31, 2012
Renewables Portfolio Standard
Dec. 31, 2012
Renewables Portfolio Standard
RECs
Jun. 30, 2013
Renewables Portfolio Standard
Regulatory matters:                  
Amount of retroactive ratemaking proposal included in DRA's recommendation to increase accumulated depreciation       $ 2,000,000          
Net regulatory assets 184,893,000 176,015,000       2,000,000      
Portion of deferred rate case costs required to be written off, if DRA prevails           50.00%      
Provision for loss                 0
Number of renewable energy credits that would be purchased               582,000  
Agreement period to purchase renewable energy credits             10 years    
Amount billed to customers as surcharges     $ 835,000   $ 1,200,000        
Recovery periods           12 months      
Percentage of deferred rate case cost to be borne by shareholders           50.00%