Land and Development Costs and Subsurface Interests - Real Estate Revenues (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Total Revenues	$ 27,635,543	$ 12,210,945	$ 12,873,938	$ 18,354,435	$ 19,783,432	$ 8,297,715	$ 7,608,208	$ 7,308,325	$ 71,074,861	$ 42,997,680	$ 36,056,637
Operating Segments | Real Estate Operations
Total Revenues	$ 19,165,183	$ 4,643,646	$ 4,774,620	$ 9,560,898	$ 11,966,554	$ 1,748,398	$ 1,368,141	$ 859,801	38,144,347	15,942,894	13,492,734
Operating Segments | Real Estate Operations | Tomoka Town Center [Member]
Total Revenues									17,490,000	8,128,000
Operating Segments | Real Estate Operations | Reimbursement of Infrastructure Costs [Member]
Total Revenues									4,500,000
Operating Segments | Real Estate Operations | Impact Fee and Mitigation Credit Sales [Member]
Total Revenues									2,220,000	463,000	926,000
Operating Segments | Real Estate Operations | Subsurface Interests [Member]
Total Revenues									1,802,000	3,003,000	3,704,000
Operating Segments | Real Estate Operations | Fill Dirt and Other [Member]
Total Revenues									261,000	73,000	119,000
Land [Member] | Operating Segments | Real Estate Operations
Total Revenues									$ 11,871,000	$ 4,276,000	$ 8,744,000