Mortagage on real estate (Details) (USD $)	Breakwater Bay apartments USD ($)	Northside on Travis apartments	Capitol Hill apartments	Toulon	Mansions of Mansfield	Preserve at Pecan Creek	Parc at Clarksville
Balance of mortagage at Dec. 31, 2012	$ 0
No of units in apartments	176	200	156	240	208	192	168
Amortization schedule in years.	40	40	40	40	40	40	40
Balance of mortagage. at Mar. 31, 2013	$ 0
Accrued interest (Percentage) at Mar. 31, 2013	2.50%	2.50%	2.50%	5.37%	2.50%	2.50%	2.50%
New mortagage (Millions) at Mar. 31, 2013	9.8	13.9	9.4	17	16.3	15.1	13.4
paid off amt on existing mortagage (Millions) at Mar. 31, 2013	9.1	13.5	8.8		15.8	14.6	13.0
closing costs (Millions) at Mar. 31, 2013	0.3	1.3	0.3		1.2	1.1	0.7