Reporting Segments and Related Information - Information Pertaining to Assets of Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Information pretaining to assets of the business segments
Identifiable Assets	$ 529,048	$ 518,199	$ 439,541
Depreciation and amortization	5,424	5,689	5,657
Capital Expenditures	22,580	21,709	26,380
Operating Segments | Real estate - commercial/industrial
Information pretaining to assets of the business segments
Identifiable Assets	65,929	63,065	65,290
Depreciation and amortization	651	650	614
Capital Expenditures	5,225	4,638	5,196
Operating Segments | Real estate - resort/residential
Information pretaining to assets of the business segments
Identifiable Assets	273,620	258,697	243,963
Depreciation and amortization	58	63	77
Capital Expenditures	13,459	14,230	16,013
Operating Segments | Mineral resources
Information pretaining to assets of the business segments
Identifiable Assets	54,144	48,305	45,066
Depreciation and amortization	1,372	1,363	1,357
Capital Expenditures	171	356	2,161
Operating Segments | Farming
Information pretaining to assets of the business segments
Identifiable Assets	40,835	36,317	36,895
Depreciation and amortization	1,897	2,080	2,146
Capital Expenditures	3,166	2,129	2,006
Operating Segments | Ranch operations
Information pretaining to assets of the business segments
Identifiable Assets	2,973	3,625	3,893
Depreciation and amortization	536	601	614
Capital Expenditures	102	220	523
Corporate
Information pretaining to assets of the business segments
Identifiable Assets	91,547	108,190	44,434
Depreciation and amortization	910	932	849
Capital Expenditures	$ 457	$ 136	$ 481