COMMITMENTS AND CONTINGENCIES (Details)	1 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended
	Feb. 28, 2015 USD ($)	Jun. 30, 2015 USD ($) item	Jun. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) item shares	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Commitments and contingencies
Outstanding loan commitments and approvals to fund loans		$ 20,384,000			$ 20,384,000
Future obligations under leases to fund tenant improvements and in other future construction obligation		23,883,000			23,883,000
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
2015 (Six months ending December 31, 2015)		361,000			361,000
2016		743,000			743,000
2017		749,000			749,000
2018		607,000			607,000
2019		503,000			503,000
Thereafter		128,528,000			128,528,000
Total		131,491,000			131,491,000
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		438,000	$ 438,000		$ 876,000	$ 876,000
Straight line rent liability		11,625,000			11,625,000		$ 11,038,000
Office space in Dallas, Texas
Commitments and contingencies
Rent expense		72,000	49,000	$ 65,000	130,000
Restricted share awards
Commitments and contingencies
Unrecognized compensation expense		$ 103,000			$ 103,000
Executive officers
Commitments and contingencies
Number of employees covered under employment agreement | item					2
Multiplier used for the calculation of severance compensation or change in control payments | item		2.99			2.99
Period of annual compensation paid to employee used to calculate severance compensation or change in control payments					3 years
Multiplier used for the calculation of payments in the event of death of employee | item		2			2
Multiplier used for the calculation of payments in the event of disability to employee | item		1			1
Executive officers | Restricted share awards
Commitments and contingencies
Stock-based compensation expense		$ 8,000	19,000		$ 26,000	19,000
Employment agreements | Executive officers | Restricted share awards
Commitments and contingencies
Share awards to be granted as retention bonus under employment agreement | shares					105,000
Stock-based compensation expense		316,000	$ 315,000		$ 632,000	$ 315,000
Unrecognized compensation expense		$ 631,000			$ 631,000