Business Segment Data - Summary of Operations in Different Segments (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Income Properties	$ 5,614,294	$ 5,034,090	$ 4,132,052	$ 4,260,675	$ 4,148,526	$ 3,864,632	$ 3,552,130	$ 3,404,359	$ 19,041,111	$ 14,969,647	$ 12,828,214
Commercial Loan Investments	874,551	546,640	638,710	631,484	609,178	382,087	255,769	943,890	2,691,385	2,190,924	1,712,913
Real Estate Operations	11,966,554	1,748,398	1,368,141	859,801	2,308,143	8,781,759	1,053,585	1,349,247	15,942,894	13,492,734	6,177,496
Golf Operations	1,308,409	949,083	1,448,567	1,537,426	1,281,073	994,651	1,432,398	1,417,379	5,243,485	5,125,501	5,074,898
Agriculture and Other Income	19,624	19,504	20,738	18,939	19,779	182,731	17,477	57,844	78,805	277,831	276,309
Total Revenues	19,783,432	8,297,715	7,608,208	7,308,325	8,366,699	14,205,860	6,311,359	7,172,719	42,997,680	36,056,637	26,069,830
Operating Income (Loss)	11,445,821	5,143,440	2,186,161	1,493,887	1,989,998	6,018,340	1,680,299	2,903,869	20,269,309	12,592,506	6,279,377
Depreciation and Amortization	1,568,277	$ 1,417,129	$ 1,071,752	$ 1,155,739	985,478	$ 886,618	$ 846,381	$ 772,008	5,212,897	3,490,485	2,885,317
Capital Expenditures									111,293,694	74,334,247	58,447,040
Identifiable Assets	406,016,513				276,592,448				406,016,513	276,592,448
Income Properties [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									15,385,176	13,015,113	11,494,240
Depreciation and Amortization									4,898,803	3,210,028	2,650,310
Capital Expenditures									84,261,324	43,766,003	40,418,981
Identifiable Assets	277,519,902				190,087,575				277,519,902	190,087,575
Commercial Loan Investments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									2,691,385	2,190,924	1,712,913
Capital Expenditures									15,394,879	30,208,075	17,658,204
Identifiable Assets	38,487,119				30,274,302				38,487,119	30,274,302
Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									11,650,370	8,630,445	2,291,609
Capital Expenditures									11,489,272
Identifiable Assets	59,787,157				43,833,515				59,787,157	43,833,515
Golf Operations [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									(349,600)	(405,242)	(412,177)
Depreciation and Amortization									263,335	241,134	205,097
Capital Expenditures									109,505	219,199	223,690
Identifiable Assets	3,607,259				3,639,903				3,607,259	3,639,903
Agriculture and Other Income [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									(147,749)	88,527	127,949
Depreciation and Amortization									50,759	39,323	29,910
Capital Expenditures									38,714	140,970	146,165
Identifiable Assets	$ 26,615,076				$ 8,757,153				26,615,076	8,757,153
General and Corporate Expense [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									$ (8,960,273)	$ (10,927,261)	$ (8,935,157)