Unaudited Consolidated Statements of Operations - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Total revenues	$ 13,469,000	$ 5,702,000
Costs and Expenses:
Total expenses	11,924,000	9,264,000
Operating income (loss)	1,545,000	(3,562,000)
Other Income:
Investment income	283,000	103,000
Other income, net	(14,000)	(14,000)
Total other income	269,000	89,000
Income (loss) from operations before equity in earnings of unconsolidated joint ventures	1,814,000	(3,473,000)
Equity in earnings of unconsolidated joint ventures, net	167,000	228,000
Income (loss) before income tax expense	1,981,000	(3,245,000)
Income tax expense (benefit)	526,000	(1,332,000)
Net income (loss)	1,455,000	(1,913,000)
Net loss attributable to non-controlling interest	(2,000)	(11,000)
Net income (loss) attributable to common stockholders	$ 1,457,000	$ (1,902,000)
Net income (loss) per share attributable to common stockholders, basic (in dollars per share)	$ 0.06	$ (0.09)
Net income (loss) per share attributable to common stockholders, diluted (in dollars per share)	$ 0.06	$ (0.09)
Real estate - commercial/industrial
Revenues:
Total revenues	$ 2,154,000	$ 2,189,000
Other Income:
Equity in earnings of unconsolidated joint ventures, net	167,000	228,000
Income (loss) before income tax expense	1,002,000	674,000
Real estate - resort/residential
Revenues:
Total revenues	0
Mineral resources
Revenues:
Total revenues	9,131,000	2,001,000
Other Income:
Income (loss) from operations before equity in earnings of unconsolidated joint ventures	4,900,000	677,000
Ranch operations
Revenues:
Total revenues	989,000	1,081,000
Other Income:
Income (loss) from operations before equity in earnings of unconsolidated joint ventures	(400,000)	(412,000)
Operating Segments | Real estate - commercial/industrial
Revenues:
Total revenues	2,154,000	2,189,000
Costs and Expenses:
Total expenses	1,319,000	1,743,000
Operating Segments | Real estate - resort/residential
Costs and Expenses:
Total expenses	415,000	630,000
Operating Segments | Mineral resources
Revenues:
Total revenues	9,131,000	2,001,000
Costs and Expenses:
Total expenses	4,231,000	1,324,000
Operating Segments | Farming
Revenues:
Total revenues	1,195,000	431,000
Costs and Expenses:
Total expenses	1,838,000	1,323,000
Operating Segments | Ranch operations
Revenues:
Total revenues	989,000	1,081,000
Costs and Expenses:
Total expenses	1,389,000	1,493,000
Corporate expenses
Costs and Expenses:
Total expenses	$ 2,732,000	$ 2,751,000