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NON-UTILITY OPERATING REVENUE AND EXPENSES (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Public Utility, Property, Plant and Equipment [Line Items]      
Non-utility operating revenue $ 3,787,000 $ 4,204,000 $ 5,227,000
Summary of non-utility operating expenses [Abstract]      
Non-utility operating expenses 2,100,000 3,148,000 3,780,000
Artesian Utility [Member]
      
Public Utility, Property, Plant and Equipment [Line Items]      
Non-utility operating revenue 3,200,000 1,900,000 3,000,000
Summary of non-utility operating expenses [Abstract]      
Non-utility operating expenses 1,777,000 1,823,000 2,311,000
Artesian Development [Member]
      
Summary of non-utility operating expenses [Abstract]      
Non-utility operating expenses 42,000 39,000 24,000
Artesian Resources [Member]
      
Public Utility, Property, Plant and Equipment [Line Items]      
Non-utility operating revenue 600,000 2,100,000 1,700,000
Summary of non-utility operating expenses [Abstract]      
Non-utility operating expenses 263,000 993,000 847,000
Artesian Consulting Engineers [Member]
      
Public Utility, Property, Plant and Equipment [Line Items]      
Non-utility operating revenue   175,000 539,000
Summary of non-utility operating expenses [Abstract]      
Non-utility operating expenses $ 18,000 $ 293,000 $ 598,000