Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net (loss) income	$ (1,579,000)	$ 515,000	$ 2,912,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	4,551,000	4,549,000	5,090,000
Amortization of premium/discount of marketable securities	298,000	434,000	555,000
Equity in earnings of unconsolidated joint ventures, net	(4,227,000)	(7,098,000)	(6,324,000)
Non-cash retirement plan expense	469,000	1,046,000	997,000
Loss (gain) on sale of real estate/assets	45,000	(1,183,000)	(95,000)
Deferred income taxes	66,000	1,939,000	(120,000)
Stock compensation expense	3,552,000	4,585,000	3,757,000
Excess tax benefit of stock-based compensation	107,000	0	0
Distribution of earnings from unconsolidated joint ventures	7,200,000	4,500,000	7,200,000
Changes in operating assets and liabilities:
Receivables, inventories, prepaids and other assets, net	1,660,000	(1,603,000)	2,733,000
Current liabilities, net	(2,312,000)	(2,099,000)	263,000
Net cash provided by operating activities	9,830,000	5,585,000	16,968,000
Investing Activities
Maturities and sales of marketable securities	8,126,000	11,750,000	24,157,000
Funds invested in marketable securities	(52,716,000)	(5,983,000)	(15,574,000)
Real estate and equipment expenditures	(21,709,000)	(26,380,000)	(28,048,000)
Reimbursement proceeds from Communities Facilities District	0	6,155,000	4,971,000
Proceeds from sale of real estate/assets	0	4,616,000	796,000
Investment in unconsolidated joint ventures	(310,000)	(2,000,000)	(52,000)
Distribution of equity from unconsolidated joint ventures	3,114,000	1,600,000	1,100,000
Investments in long-term water assets	(4,717,000)	0	0
Other	(2,000)	0	(11,000)
Net cash used in investing activities	(68,214,000)	(10,242,000)	(12,661,000)
Financing Activities
Borrowings of line of credit	13,300,000	20,700,000	17,540,000
Repayments of line of credit	(21,000,000)	(13,000,000)	(24,390,000)
Repayments of long-term debt	(3,908,000)	(815,000)	(244,000)
Net proceeds from rights offering	89,867,000	0	0
Taxes on vested stock grants	(1,026,000)	(2,900,000)	(921,000)
Net cash provided by (used in) provided by financing activities	77,233,000	3,985,000	(8,015,000)
Increase (decrease) in cash and cash equivalents	18,849,000	(672,000)	(3,708,000)
Cash and cash equivalents at beginning of year	1,258,000	1,930,000	5,638,000
Cash and cash equivalents at end of year	20,107,000	1,258,000	1,930,000
Supplemental cash flow information
Non cash capital contribution to unconsolidated joint venture	1,339,000	0	0
Accrued capital expenditures included in current liabilities	814,000	652,000	329,000
Capital expenditure financing arrangement	0	467,000	0
Taxes paid (net of refunds)	$ (124,000)	$ 1,135,000	$ 1,817,000