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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) $ / shares $ / item | Sep. 30, 2016 USD ($) $ / shares $ / item | Jun. 30, 2016 USD ($) $ / shares $ / item | Mar. 31, 2016 USD ($) $ / shares $ / item | Dec. 31, 2015 USD ($) $ / shares $ / item | Sep. 30, 2015 USD ($) $ / shares $ / item | Jun. 30, 2015 USD ($) $ / shares $ / item | Mar. 31, 2015 USD ($) $ / shares $ / item | Dec. 31, 2016 USD ($) $ / shares $ / item | Dec. 31, 2015 USD ($) $ / shares $ / item | Dec. 31, 2014 USD ($) $ / shares
QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 12,745,657 | $ 12,371,881 | $ 12,254,264 | $ 12,183,288 | $ 12,133,802 | $ 11,209,974 | $ 11,061,418 | $ 11,075,520 | $ 49,555,090 | $ 45,480,714 | $ 42,632,319
Expenses | 9,232,731 | 9,274,045 | 9,019,667 | 8,768,697 | 8,610,725 | 7,832,159 | 7,767,467 | 8,387,609 | 36,295,140 | 32,597,960 | 31,545,752
Income Before Other Income (Expense) | 3,512,926 | 3,097,836 | 3,234,597 | 3,414,591 | 3,523,077 | 3,377,815 | 3,293,951 | 2,687,911 | 13,259,950 | 12,882,754 | 11,086,567
Other Expenses | (1,984,171) | (1,887,089) | (2,254,011) | (2,183,827) | (2,330,373) | (2,304,069) | (2,197,494) | (2,278,253) | (8,309,098) | (9,110,189) | (10,061,717)
Net Income | $ 1,528,755 | $ 1,210,747 | $ 980,586 | $ 1,230,764 | $ 1,192,704 | $ 1,073,746 | $ 1,096,457 | $ 409,658 | $ 4,950,852 | $ 3,772,565 | $ 1,024,850
Net Income per Unit before Discontinued Operations | $ / shares | $ 12.24 | $ 9.69 | $ 7.85 | $ 9.84 | $ 9.47 | $ 8.51 | $ 8.66 | $ 3.22 | $ 39.62 | $ 29.86 |
Net Income per Unit (in dollars per unit) | $ / shares | $ 12.24 | $ 9.69 | $ 7.85 | $ 9.84 | $ 9.47 | $ 8.51 | $ 8.66 | $ 3.22 | $ 39.62 | $ 29.86 | $ 7.96
Income Per Depositary Receipt Before Discontinued Operations (in dollars per unit) | $ / item | 0.41 | 0.32 | 0.26 | 0.33 | 0.32 | 0.28 | 0.29 | 0.11 | 1.32 | 1.00 |
Net Income Per Depositary Receipt (in dollars per receipt) | $ / item | 0.41 | 0.32 | 0.26 | 0.33 | 0.32 | 0.28 | 0.29 | 0.11 | 1.32 | 1.00 |

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