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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) $ / shares $ / item | Sep. 30, 2017 USD ($) $ / shares $ / item | Jun. 30, 2017 USD ($) $ / shares $ / item | Mar. 31, 2017 USD ($) $ / shares $ / item | 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, 2017 USD ($) $ / shares $ / item | Dec. 31, 2016 USD ($) $ / shares $ / item | Dec. 31, 2015 USD ($) $ / shares
QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 13,874,185 | $ 13,421,805 | $ 12,787,791 | $ 12,743,607 | $ 12,745,657 | $ 12,371,881 | $ 12,254,264 | $ 12,183,288 | $ 52,827,388 | $ 49,555,090 | $ 45,480,714
Expenses | 10,369,714 | 10,493,852 | 8,817,160 | 9,001,696 | 9,232,731 | 9,274,045 | 9,019,667 | 8,768,697 | 38,682,422 | 36,295,140 | 32,597,960
Income Before Other Income (Expense) | 3,504,471 | 2,927,953 | 3,970,631 | 3,741,911 | 3,512,926 | 3,097,836 | 3,234,597 | 3,414,591 | 14,144,966 | 13,259,950 | 12,882,754
Other Expenses | (1,816,201) | (2,056,233) | (1,486,924) | (1,847,677) | (1,984,171) | (1,887,089) | (2,254,011) | (2,183,827) | (7,207,035) | (8,309,098) | (9,110,189)
Net Income | $ 1,688,270 | $ 871,720 | $ 2,483,707 | $ 1,894,234 | $ 1,528,755 | $ 1,210,747 | $ 980,586 | $ 1,230,764 | $ 6,937,931 | $ 4,950,852 | $ 3,772,565
Net Income per Unit before Discontinued Operations | $ / shares | $ 13.56 | $ 7.01 | $ 19.97 | $ 15.23 | $ 12.24 | $ 9.69 | $ 7.85 | $ 9.84 | $ 55.77 | $ 39.62 |
Net Income per Unit (in dollars per unit) | $ / shares | $ 13.56 | $ 7.01 | $ 19.97 | $ 15.23 | $ 12.24 | $ 9.69 | $ 7.85 | $ 9.84 | $ 55.77 | $ 39.62 | $ 29.86
Income Per Depositary Receipt Before Discontinued Operations (in dollars per unit) | $ / item | 0.45 | 0.23 | 0.67 | 0.51 | 0.41 | 0.32 | 0.26 | 0.33 | 1.86 | 1.32 |
Net Income Per Depositary Receipt (in dollars per receipt) | $ / item | 0.45 | 0.23 | 0.67 | 0.51 | 0.41 | 0.32 | 0.26 | 0.33 | 1.86 | 1.32 |

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