SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 4 (Details) - USD ($)					12 Months Ended
	May 08, 2019	May 02, 2018	Jun. 28, 2017	May 03, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 09, 2015
Stock Compensation Plans [Abstract]
Granted (in shares)					0	0	0
Compensation costs					$ 181,000	$ 192,000	$ 423,000
Unrecognized expense related to non-vested awards of restricted shares granted					63,000
Accounts Receivable [Abstract]
Expense related to allowance for doubtful accounts					200,000	100,000
Summary of changes in entity's accounts receivable [Abstract]
Gross accounts receivable					7,177,000	8,391,000	9,185,000
Less allowance for doubtful accounts					264,000	232,000	288,000
Total Accounts Receivable					6,913,000	8,159,000	7,796,000
Summary of allowance for doubtful accounts [Abstract]
Beginning balance					232,000	288,000	263,000
Allowance adjustments					198,000	103,000	215,000
Recoveries					34,000	47,000	41,000
Write off of uncollectible accounts					(200,000)	(206,000)	(231,000)
Ending balance					$ 264,000	232,000	288,000
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 costs					$ 181,000	192,000	423,000
Customer accounts receivable - water [Member]
Summary of changes in entity's accounts receivable [Abstract]
Gross accounts receivable					5,574,000	5,585,000	5,487,000
Contractual amounts due from developers and other [Member]
Summary of changes in entity's accounts receivable [Abstract]
Gross accounts receivable					$ 1,603,000	$ 2,806,000	$ 3,698,000
Class A Stock [Member] | 2015 Equity Compensation Plan [Member]
Stock Compensation Plans [Abstract]
Number of share authorize under equity compensation plan (in shares)								331,500
Class A Stock [Member] | Unrestricted Stock [Member]
Stock Compensation Plans [Abstract]
Granted, restricted stock awards (in shares)			6,568
Fair market value (in dollars per share)			$ 38.06
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)	$ 36.11	$ 38.51		$ 38.10
Award vesting period					1 year