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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
QUARTERLY FINANCIAL DATA (UNAUDITED)
Revenue	$ 10,374,345	$ 9,967,752	$ 9,002,762	$ 9,019,693	$ 8,986,514	$ 8,759,026	$ 8,690,579	$ 8,733,052	$ 38,364,552	$ 35,169,170	$ 33,584,787
Expenses	7,654,735	7,484,223	6,113,940	5,980,237	5,626,758	5,633,984	5,346,294	5,782,391	27,233,135	22,389,427	22,339,029
Income Before Other Income and Discontinued Operations	2,719,610	2,483,529	2,888,822	3,039,456	3,359,756	3,125,042	3,344,285	2,950,661	11,131,417	12,779,743	11,245,758
Income (Loss) From Discontinued Operations	(113)	(654)	3,678,922	19,731	12,572	(6,853)	14,345	13,284	3,697,886	33,348	7,813,412
Other Income (Loss)	(2,401,979)	(2,515,749)	(2,098,628)	(2,157,562)	(2,187,198)	(2,343,736)	(2,311,368)	(2,336,991)	(9,173,918)	(9,179,293)	(9,767,889)
Net Income	$ 317,518	$ (32,874)	$ 4,469,116	$ 901,625	$ 1,185,130	$ 774,453	$ 1,047,262	$ 626,954	$ 5,655,385	$ 3,633,798	$ 9,291,281
Net Income per Unit before Discontinued Operations (in dollars per unit)	$ 2.45	$ (0.25)	$ 6.08	$ 6.77	$ 8.97	$ 5.95	$ 7.86	$ 4.67	$ 15.07	$ 27.44	$ 11.24
Income per Unit from Discontinued Operations (in dollars per unit)	$ 0.00	$ (0.01)	$ 28.29	$ 0.15	$ 0.10	$ (0.05)	$ 0.11	$ 0.10	$ 28.48	$ 0.25	$ 59.42
Net Income per Unit (in dollars per unit)	$ 2.45	$ (0.25)	$ 34.37	$ 6.93	$ 9.07	$ 5.90	$ 7.97	$ 4.77	$ 43.55	$ 27.69	$ 70.66
Income Per Depositary Receipt Before Discontinued Operations (in dollars per share)	$ 0.08	$ (0.01)	$ 0.20	$ 0.23	$ 0.30	$ 0.20	$ 0.26	$ 0.16	$ 0.50	$ 0.91
Income Per Depositary receipt From Discontinued Operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.94	$ 0.01	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.95	$ 0.01
Net Income per Depositary Receipt after Discontinued Operations (in dollars per share)	$ 0.08	$ (0.01)	$ 1.15	$ 0.23	$ 0.30	$ 0.20	$ 0.27	$ 0.16	$ 1.45	$ 0.92

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