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v3.20.4

DEBT, Lines of Credit (Details) |  | 12 Months Ended
--- | --- | ---
Apr. 28, 2020 USD ($) Agreement | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Artesian Water [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Weighted average interest rate paid on the lines of credit |  | 1.82% |
Citizens Bank [Member] | Artesian Resources [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Line of credit |  | $ 40,000,000 |
Available funds under this line of credit |  | $ 31,200,000 |
Expiration date of line of credit |  | May 31, 2021 |
Citizens Bank [Member] | LIBOR [Member] | Artesian Resources [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Variable rate for credit facility |  | LIBOR |
Interest rate |  | 1.25% |
CoBank [Member] | Artesian Resources [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Line of credit |  | $ 20,000,000 |
Available funds under this line of credit |  | $ 2,000,000.0 |
CoBank [Member] | Artesian Water [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Expiration date of line of credit |  | Jul. 30, 2021 |
Patronage refunds |  | $ 1,000,000.0 | $ 900,000
Additional cash patronage distribution |  | $ 107,000 |
Additional cash patronage distribution, refund rate |  | 0.10% |
Annual patronage refund rate |  | 1.00% | 0.80%
CoBank [Member] | Artesian Water Maryland [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Line of credit |  | $ 10,000,000 |
CoBank [Member] | LIBOR [Member] | Artesian Water [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Variable rate for credit facility |  | LIBOR |
Interest rate |  | 1.50% |
Delaware Drinking Water State Revolving Fund [Member] | Artesian Water [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Number of financing agreements | Agreement | 3 |  |
Interest rate | 0.60% |  |
Fee rate | 0.006 |  |
Delaware Drinking Water State Revolving Fund [Member] | Financing Agreement One [Member] | Artesian Water [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Advance from financing agreements | $ 1,700,000 |  |
Delaware Drinking Water State Revolving Fund [Member] | Financing Agreement Two [Member] | Artesian Water [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Advance from financing agreements | 1,000,000.0 |  |
Delaware Drinking Water State Revolving Fund [Member] | Financing Agreement Three [Member] | Artesian Water [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Advance from financing agreements | $ 1,300,000 |  |

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