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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 9,104,015 | $ 8,875,596 | $ 8,800,416 | $ 8,852,382 | $ 8,760,538 | $ 8,648,526 | $ 8,345,643 | $ 8,280,894 | $ 35,632,409 | $ 34,035,602 | $ 32,255,957
Expenses | 5,704,596 | 5,730,319 | 5,413,735 | 5,861,694 | 5,722,971 | 5,665,232 | 5,508,842 | 5,773,941 | 22,710,344 | 22,670,986 | 21,916,664
Income Before Other Income (loss) and Discontinued Operations | 3,399,419 | 3,145,277 | 3,386,681 | 2,990,688 | 3,037,567 | 2,983,294 | 2,836,801 | 2,506,953 | 12,922,065 | 11,364,616 | 10,339,293
Income (loss) from discontinued operations |  |  |  |  | (308) | (3,054) | 7,736,789 | 68,599 |  | 7,802,026 | 219,867
Other Income (loss) | (2,214,288) | (2,370,824) | (2,339,420) | (2,363,735) | (2,469,002) | (2,523,314) | (2,480,305) | (2,402,740) | (9,288,267) | (9,875,361) | (11,918,392)
Net Income (loss) | $ 1,185,131 | $ 774,453 | $ 1,047,261 | $ 626,953 | $ 568,257 | $ 456,926 | $ 8,093,285 | $ 172,812 | $ 3,633,798 | $ 9,291,281 | $ (1,359,232)
Net Income (loss) per Unit before discontinued operations (in dollars per unit) | $ 9.07 | $ 5.90 | $ 7.97 | $ 4.77 | $ 4.33 | $ 3.50 | $ 2.71 | $ 0.79 | $ 27.69 | $ 11.33 | $ (11.99)
Income (loss) per Unit from discontinued operations (in dollars per unit) |  |  |  |  |  | $ (0.02) | $ 58.84 | $ 0.52 |  | $ 59.34 | $ 1.67
Net Income per Unit (in dollars per unit) | $ 9.07 | $ 5.90 | $ 7.97 | $ 4.77 | $ 4.33 | $ 3.48 | $ 61.55 | $ 1.31 | $ 27.69 | $ 70.67 | $ (10.32)
Income per depositary receipt before discontinued operations (in dollars per share) | $ 0.30 | $ 0.20 | $ 0.27 | $ 0.16 | $ 0.15 | $ 0.12 | $ 0.09 | $ 0.02 | $ 0.92 | $ 0.38 |
Income per depositary receipt from discontinued operations (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 |  |  | $ 1.96 | $ 0.02 | $ 0.00 | $ 1.98 |
Net Income (loss) per Depositary Receipt after Discontinued Operations (in dollars per share) |  |  |  |  | $ 0.15 | $ 0.12 | $ 2.05 | $ 0.04 | $ 0.92 | $ 2.36 |
Net Income per depositary receipt | $ 0.30 | $ 0.20 | $ 0.27 | $ 0.16 |  |  |  |  | $ 0.92 |  |

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