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DEBT (Details) (USD $) | 2 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 107,368,000 | $ 108,257,000 |
Less: current maturities (principal amount) |  | 1,111,000 | 1,718,000 |
Total long-term debt |  | 106,257,000 | 106,539,000 |
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |  |  |
2013 |  | 1,111,000 |  |
2014 |  | 1,187,000 |  |
2015 |  | 1,211,000 |  |
2016 |  | 1,235,000 |  |
2017 |  | 1,260,000 |  |
Thereafter |  | 101,364,000 |  |
Promissory Note, variable interest, due 08/01/2012 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 0 | 580,000 |
First mortgage bonds [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 98,000,000 | 98,600,000 |
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |  |  |
2013 |  | 600,000 |  |
2014 |  | 600,000 |  |
2015 |  | 600,000 |  |
2016 |  | 600,000 |  |
2017 |  | 600,000 |  |
Thereafter |  | 95,000,000 |  |
First mortgage bonds [Member] | Series O, 8.17%, due 12/29/2020 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 20,000,000 | 20,000,000 |
First mortgage bonds [Member] | Series P, 6.58%, due 01/31/2018 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 25,000,000 | 25,000,000 |
First mortgage bonds [Member] | Series Q, 4.75%, due 12/01/2043 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 15,400,000 | 15,400,000 |
First mortgage bonds [Member] | Series R, 5.96%, due 12/31/2028 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 25,000,000 | 25,000,000 |
First mortgage bonds [Member] | Series S, 6.73%, due 12/31/2033 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 12,600,000 | 13,200,000 |
State revolving fund loans [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 9,368,000 | 9,077,000 |
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |  |  |
2013 |  | 511,000 |  |
2014 |  | 587,000 |  |
2015 |  | 611,000 |  |
2016 |  | 635,000 |  |
2017 |  | 660,000 |  |
Thereafter |  | 6,364,000 |  |
State revolving fund loans [Member] | 4.48%, due 08/01/2021 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 2,410,000 | 2,624,000 |
State revolving fund loans [Member] | 3.57%, due 09/01/2023 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 940,000 | 1,010,000 |
State revolving fund loans [Member] | 3.64%, due 05/01/2025 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 1,570,000 | 1,667,000 |
State revolving fund loans [Member] | 3.41%, due 02/01/2031 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 2,936,000 | 2,993,000 |
State revolving fund loans [Member] | 3.40%, due 07/01/2032 [Member] |  |  |  |
Long-term debt consists of [Abstract] |  |  |  |
Sub-total of long-term debt |  | 1,512,000 | 783,000 |
Class A Stock [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Stock issued during the period (in shares) | 888,000 | 99,330 | 85,600 | 129,876
Net proceeds from sale of common stock |  |  | 15,600,000 |
Citizens Bank [Member] | Artesian Resources [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit |  | 40,000,000 |  |
Available funds under this line of credit |  | 29,300,000 |  |
Expiration date of line of credit |  | May 30, 2013 |  |
Citizens Bank [Member] | LIBOR [Member] | Artesian Resources [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Variable rate for credit facility |  | LIBOR |  |
Variable rate of credit facility (in hundredths) |  | 1.00% |  |
CoBank [Member] | Artesian Water [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit |  | 20,000,000 |  |
Available funds under this line of credit |  | 20,000,000 |  |
Expiration date of line of credit |  | Jan. 14, 2014 |  |
CoBank [Member] | Artesian Water Maryland [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit |  | 10,000,000 |  |
CoBank [Member] | LIBOR [Member] | Artesian Water [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Variable rate for credit facility |  | LIBOR |  |
Variable rate of credit facility (in hundredths) |  | 1.50% |  |

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