LAND AND SUBSURFACE INTERESTS - Other Real Estate Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Land and development costs and subsurface interests
Impact fees	$ 2,000
Mitigation credits	460,000
Impact Fee and Mitigation Credits	462,040	$ 1,125,269
Mitigation credits sold	1,000,000	1,600,000
Gain on mitigation credits sold	$ 882,000	$ 1,300,000
Gain on mitigation credits sold (in dollars per share)	$ 0.12	$ 0.15
Cash payments received for impact fees	$ 338,000	$ 519,000
LandShark Bar and Grill
Land and development costs and subsurface interests
Cash payments received for impact fees	72,000
Real Estate Operations | Cost of revenues
Land and development costs and subsurface interests
Mitigation credits transferred		$ 298,000
Real Estate Operations | Buc'ees - East of I-95
Land and development costs and subsurface interests
Mitigation credits transferred	$ 124,000