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Summary of Significant Accounting Policies: (Details) (USD $) | 0 Months Ended | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended
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May 20, 2013 | Mar. 31, 2014 registrant | Mar. 31, 2013 | May 31, 2013 AWR Promissory Note | Mar. 31, 2014 AWR Syndicated Credit Facility | Mar. 31, 2014 GSWC | Mar. 31, 2013 GSWC | Mar. 31, 2014 GSWC Purchase, production, distribution and sale of water customer | Mar. 31, 2014 GSWC Electricity distribution customer | Mar. 31, 2014 ASUS | Mar. 31, 2013 ASUS | Mar. 31, 2014 ASUS Contracts | Mar. 31, 2014 Fourth Amendment to Revolving Credit Agreement AWR Syndicated Credit Facility | May 23, 2013 Fourth Amendment to Revolving Credit Agreement AWR Syndicated Credit Facility | Mar. 31, 2014 Sales GSWC Electricity distribution
Nature of Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers served |  |  |  |  |  |  |  | 257,000 | 24,000 |  |  |  |  |  |
Percentage of total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00%
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases |  |  |  |  |  |  |  |  |  |  |  | 50 years |  |  |
Basis of Presentation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of registrants filing combined report |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maximum borrowing capacity |  |  |  | 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on line of credit |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  | 100,000,000.0 |
Notes Payable to Banks: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on line of credit |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  | 100,000,000.0 |
Maximum borrowing capacity on line of credit, potential election to increase |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000.0 |
Line of credit, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 24,000,000 |  |
Sales and Use Taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Franchise fees billed to customers and recorded as operating revenue |  |  |  |  |  | 845,000 | 811,000 |  |  |  |  |  |  |  |
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases |  |  |  |  |  |  |  |  |  |  |  | 50 years |  |  |
Non-income tax assessments accounted on a gross basis |  | $ 4,325,000 | $ 4,148,000 |  |  | $ 3,896,000 | $ 3,716,000 |  |  | $ 149,000 | $ 162,000 |  |  |  |

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