SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 4 (Details)					1 Months Ended	12 Months Ended
	Jul. 19, 2022 USD ($) Installment	May 03, 2022 $ / shares shares	May 04, 2021 $ / shares shares	May 06, 2020 $ / shares shares	Aug. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) Installment shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Jun. 30, 2021 USD ($)
Stock Compensation Plans [Abstract]
Granted (in shares) | shares						0	0	0
Stock compensation						$ 152,000	$ 193,000	$ 178,000
Unrecognized expense related to non-vested awards of restricted shares granted						76,000
ACCOUNTS RECEIVABLE [Abstract]
Litigation settlement amount	$ 10,000,000					10,000,000
Litigation settlement amount received					$ 2,500,000
Litigation settlement, remaining amount	$ 7,500,000					$ 7,500,000
Number of installments | Installment	3					3
Increase (decrease) in reserve for bad debt							500,000		$ (300,000)
Expense related to allowance for doubtful accounts						$ 100,000	100,000
Changes in Accounts Receivable [Abstract]
Gross accounts receivable						13,927,000	8,796,000
Less allowance for doubtful accounts						416,000	429,000
Total Accounts Receivable						13,511,000	8,367,000
Summary of allowance for doubtful accounts [Abstract]
Beginning balance						429,000	862,000
Allowance adjustments						146,000	(236,000)
Recoveries						28,000	25,000
Write off of uncollectible accounts						(187,000)	(222,000)
Ending balance						$ 416,000	429,000	862,000
Cash and Cash Equivalents [Abstract]
Maximum maturity period of temporary cash investments considered as cash equivalents						3 months
Inventories [Abstract]
Increase in materials and supplies in inventory						$ 2,769,000	398,000	271,000
Restricted Stock [Member]
Stock Compensation Plans [Abstract]
Stock compensation						152,000	193,000	$ 178,000
Customer Accounts Receivable - Water [Member]
Changes in Accounts Receivable [Abstract]
Gross accounts receivable						5,981,000	5,986,000
Customer accounts receivable - wastewater [Member]
Changes in Accounts Receivable [Abstract]
Gross accounts receivable						482,000	1,326,000
Settlement Agreement Receivable [Member]
Changes in Accounts Receivable [Abstract]
Gross accounts receivable						2,532,000	0
Miscellaneous accounts receivable [Member]
Changes in Accounts Receivable [Abstract]
Gross accounts receivable						3,781,000	786,000
Developer receivable [Member]
Changes in Accounts Receivable [Abstract]
Gross accounts receivable						$ 1,151,000	$ 698,000
Class A Stock [Member] | Restricted Stock [Member]
Stock Compensation Plans [Abstract]
Granted, restricted stock awards (in shares) | shares		5,000	5,000	5,000
Fair market value (in dollars per share) | $ / shares		$ 45.58	$ 40.11	$ 35.01