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Amount of prejudgment and post judgment interest accrued and paid.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Weighted average interest rate of debt outstanding.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

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No definition available.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of earnings distributed to patrons of the agricultural cooperative.

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-Name Accounting Standards Codification
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DEBT (Details) - USD ($)	12 Months Ended
DEBT (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Amounts paid to Chester Authority for amounts withheld related to specific rate increases	$ 3,100,000
Prejudgment and post judgment interest	400,000
Long-term debt consists of [Abstract]
Sub-total of long-term debt	104,936,000	$ 106,199,000
Less: current maturities (principal amount)	1,289,000	1,245,000
Total long-term debt	103,647,000	104,954,000
Payments of principal amounts due during the next five years and thereafter [Abstract]
2016	1,289,000
2017	1,314,000
2018	26,342,000
2019	1,371,000
2020	21,401,000
Thereafter	$ 53,219,000
Artesian Water [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate paid on the lines of credit	1.38%
First mortgage bonds [Member]
Long-term debt consists of [Abstract]
Sub-total of long-term debt	$ 96,200,000	96,800,000
Payments of principal amounts due during the next five years and thereafter [Abstract]
2016	600,000
2017	600,000
2018	25,600,000
2019	600,000
2020	20,600,000
Thereafter	48,200,000
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	10,800,000	11,400,000
State revolving fund loans [Member]
Long-term debt consists of [Abstract]
Sub-total of long-term debt	8,736,000	9,399,000
Payments of principal amounts due during the next five years and thereafter [Abstract]
2016	689,000
2017	714,000
2018	742,000
2019	771,000
2020	801,000
Thereafter	5,019,000
State revolving fund loans [Member] \| 4.48%, due 08/01/2021 [Member]
Long-term debt consists of [Abstract]
Sub-total of long-term debt	1,711,000	1,954,000
State revolving fund loans [Member] \| 3.57%, due 09/01/2023 [Member]
Long-term debt consists of [Abstract]
Sub-total of long-term debt	719,000	796,000
State revolving fund loans [Member] \| 3.64%, due 05/01/2025 [Member]
Long-term debt consists of [Abstract]
Sub-total of long-term debt	1,255,000	1,364,000
State revolving fund loans [Member] \| 3.41%, due 02/01/2031 [Member]
Long-term debt consists of [Abstract]
Sub-total of long-term debt	2,576,000	2,700,000
State revolving fund loans [Member] \| 3.40%, due 07/01/2032 [Member]
Long-term debt consists of [Abstract]
Sub-total of long-term debt	2,475,000	2,585,000
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	$ 36,500,000
Expiration date of line of credit	May 27, 2016
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	1.00%
CoBank [Member] \| Artesian Resources [Member]
Line of Credit Facility [Line Items]
Line of credit	$ 20,000,000
Available funds under this line of credit	$ 13,000,000
CoBank [Member] \| Artesian Water [Member]
Line of Credit Facility [Line Items]
Expiration date of line of credit	Apr. 12, 2016
Patronage refunds	$ 689,000	$ 682,000	$ 629,000
Annual patronage refund rate	1.00%
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	1.50%