COMMITMENTS AND CONTINGENCIES (Details)				1 Months Ended	12 Months Ended
	Jan. 01, 2016 shares	Mar. 06, 2015 shares	May. 06, 2014 shares	Feb. 28, 2015 USD ($)	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments and contingencies
Outstanding loan commitments and approvals to fund loans					$ 21,216,000
Future obligations under leases to fund tenant improvements and in other future construction obligation					33,163,000
Liability related to the settlement of a 421a tax abatement dispute						$ 4,475,000
Settlement of liability related to the settlement of a 421a tax abatement dispute				$ 4,721,000
Future noncancelable minimum lease payments
2016					743,000
2017					749,000
2018					607,000
2019					503,000
2020					541,000
Thereafter					127,679,000
Total					130,822,000
Ground lease for one of the project
Commitments and contingencies
Current annual rent					$ 503,000
Period after which the annual rental payment will be increased by greater of 15% or 50% of the increase in the Consumer Price Index					5 years
Increase in annual rental payment after every 5 years, option one (as a percent)					15.00%
Increase in annual rental payment after every 5 years, option two (as a percent)					50.00%
Adjustment period used to calculate increase in the Consumer Price Index					5 years
Increase in rent payable during the balance of the lease term expressed as a percentage of rent payable during the immediately preceding lease year commencing on June 1, 2040 and 2065					10.00%
Rent expense					$ 1,752,000	1,752,000	$ 1,752,000
Straight line rent liability					12,180,000	11,038,000
Office space in Dallas, Texas
Commitments and contingencies
Office space rent expense					235,000	175,000
Restricted share awards
Commitments and contingencies
Unrecognized compensation expense					$ 37,000
Executive officers | 2015 Equity Incentive Plan
Commitments and contingencies
Number of employees covered under employment agreement | item					2
Executive officers | Restricted share awards
Commitments and contingencies
Common stock issued | shares		2,000	2,000
Stock-based compensation expense					$ 39,000	29,000
Employment agreements | Executive officers | 2015 Equity Incentive Plan
Commitments and contingencies
Accrued payroll taxes					444,000
Stock-based compensation expense					1,263,000	$ 947,000
Unrecognized compensation expense					$ 0
Subsequent event | Employment agreements | Executive officers | 2015 Equity Incentive Plan
Commitments and contingencies
Common stock issued | shares	76,423