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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 4 (Details) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 04, 2021 | May 06, 2020 | May 08, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021
Stock Compensation Plans [Abstract] |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 0 | 0 | 0 |
Compensation expenses |  |  |  | $ 193,000 | $ 178,000 | $ 181,000 |
Unrecognized expense related to non-vested awards of restricted shares granted |  |  |  | 68,000 |  |  |
Accounts Receivable [Abstract] |  |  |  |  |  |  |
Increase (decrease) in reserve for bad debt |  |  |  |  | 500,000 |  | $ (300,000)
Expense related to allowance for doubtful accounts |  |  |  | 100,000 | 200,000 |  |
Summary of changes in entity's accounts receivable [Abstract] |  |  |  |  |  |  |
Gross accounts receivable |  |  |  | 9,292,000 | 11,024,000 |  |
Less allowance for doubtful accounts |  |  |  | 429,000 | 862,000 |  |
Total Accounts Receivable |  |  |  | 8,863,000 | 10,162,000 |  |
Summary of allowance for doubtful accounts [Abstract] |  |  |  |  |  |  |
Beginning balance |  |  |  | 862,000 | 264,000 |  |
Allowance adjustments |  |  |  | (236,000) | 754,000 |  |
Recoveries |  |  |  | 25,000 | 13,000 |  |
Write off of uncollectible accounts |  |  |  | (222,000) | (169,000) |  |
Ending balance |  |  |  | $ 429,000 | 862,000 | 264,000 |
Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |
Maximum maturity period of temporary cash investments considered as cash equivalents |  |  |  | 3 months |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Stock Compensation Plans [Abstract] |  |  |  |  |  |  |
Compensation expenses |  |  |  | $ 193,000 | 178,000 | $ 181,000 |
Customer accounts receivable - water [Member] |  |  |  |  |  |  |
Summary of changes in entity's accounts receivable [Abstract] |  |  |  |  |  |  |
Gross accounts receivable |  |  |  | 5,986,000 | 6,707,000 |  |
Customer accounts receivable - wastewater [Member] |  |  |  |  |  |  |
Summary of changes in entity's accounts receivable [Abstract] |  |  |  |  |  |  |
Gross accounts receivable |  |  |  | 1,326,000 | 1,717,000 |  |
Miscellaneous accounts receivable [Member] |  |  |  |  |  |  |
Summary of changes in entity's accounts receivable [Abstract] |  |  |  |  |  |  |
Gross accounts receivable |  |  |  | 698,000 | 699,000 |  |
Developer receivable [Member] |  |  |  |  |  |  |
Summary of changes in entity's accounts receivable [Abstract] |  |  |  |  |  |  |
Gross accounts receivable |  |  |  | $ 1,282,000 | $ 1,901,000 |  |
Class A Stock [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Stock Compensation Plans [Abstract] |  |  |  |  |  |  |
Granted, restricted stock awards (in shares) | 5,000 | 5,000 | 5,000 |  |  |  |
Fair market value (in dollars per share) | $ 40.11 | $ 35.01 | $ 36.11 |  |  |  |

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