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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Litigation with Chester Water Authority [Member] | Dec. 31, 2011 Litigation with Chester Water Authority [Member] | Oct. 31, 1997 Artesian Water [Member] | Dec. 31, 2012 Artesian Water [Member] gal | Dec. 31, 2011 Artesian Water [Member] | Dec. 31, 2005 Artesian Water [Member] | Dec. 31, 2012 Artesian Water [Member] Agreement One [Member] | Dec. 31, 2011 Artesian Water [Member] Agreement One [Member] | Dec. 31, 2010 Artesian Water [Member] Agreement One [Member] | Dec. 31, 2003 Artesian Resources [Member] | Dec. 31, 2012 Artesian Wastewater [Member] acre | Dec. 31, 2011 Artesian Wastewater [Member] | Dec. 31, 2010 Artesian Wastewater [Member] | Dec. 31, 2011 Artesian Water Maryland [Member]
Leases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease period |  |  |  |  |  | 33 years |  |  |  |  |  |  |  |  |  |  |
Rental payments |  |  |  |  |  |  |  |  |  | $ 15,400 | $ 15,300 | $ 12,700 |  | $ 41,000 | $ 40,000 | $ 40,000 |
Adjustment Factor |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |
Easement agreement period |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |
Easement payments | 32,000 | 31,000 | 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of land use as per perpetual agreement (in acres) |  |  |  |  |  |  |  |  |  |  |  |  |  | 460 |  |  |
Minimum rentals payment per year |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000 |  |  |
Termination Period |  |  |  |  |  |  |  |  |  |  |  |  |  | 180 days |  |  |
Summary of minimum annual rental payments related to operating leases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 69,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 52,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 53,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 54,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 through 2043 | 1,651,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | 1,929,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interconnections [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum purchase requirements of water |  |  |  |  |  |  | 1,459,000,000 |  |  |  |  |  |  |  |  |  |
Minimum reduced purchase requirements of water |  |  |  |  |  |  | 1,095,000,000 |  |  |  |  |  |  |  |  |  |
Summary of minimum annual purchase commitments for all interconnection agreements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 3,780,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 3,780,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 3,780,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 3,791,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 3,780,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 through 2021 | 15,132,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | 34,043,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses for purchased water | 4,000,000 | 3,800,000 | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement period |  |  |  |  |  |  |  | 2 years | 6 years |  |  |  |  |  |  |  |
Commitment amount |  |  |  |  |  |  |  | 623,000 | 1,900,000 |  |  |  |  |  |  |  |
Tank painting expense | 403,000 | 344,000 | 364,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreements with Utility Service Co |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Summary of other commitment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 |  |  |  |  |  |  | 660,000 |  |  |  |  |  |  |  |  |  |
2014 |  |  |  |  |  |  | 580,000 |  |  |  |  |  |  |  |  |  |
2015 |  |  |  |  |  |  | 430,000 |  |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  |  | 905,000 |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  | 1,455,000 |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 4,030,000 |  |  |  |  |  |  |  |  |  |
Litigation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | $ 3,430,000 | $ 2,253,000 |  | $ 2,200,000 | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Minimum amount of other commitment maturing in the next fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition Minimum amount of other commitment maturing in the second fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition Minimum amount of other commitment maturing in the third fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition Cash payments to lessor's for use of assets under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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