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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) $ / shares $ / item | Sep. 30, 2020 USD ($) $ / shares $ / item | Jun. 30, 2020 USD ($) $ / shares $ / item | Mar. 31, 2020 USD ($) $ / shares $ / item | Dec. 31, 2019 USD ($) $ / shares $ / item | Sep. 30, 2019 USD ($) $ / shares $ / item | Jun. 30, 2019 USD ($) $ / shares $ / item | Mar. 31, 2019 USD ($) $ / shares $ / item | Dec. 31, 2020 USD ($) $ / shares $ / item | Dec. 31, 2019 USD ($) $ / shares $ / item | Dec. 31, 2018 USD ($) $ / shares
QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 14,825,754 | $ 15,142,266 | $ 15,759,106 | $ 16,375,584 | $ 15,447,866 | $ 15,155,901 | $ 14,991,403 | $ 14,882,144 | $ 62,102,710 | $ 60,477,314 | $ 58,014,064
Expenses | 11,873,260 | 11,914,630 | 11,314,637 | 12,031,150 | 10,883,950 | 10,978,884 | 10,412,256 | 10,930,457 | 47,133,677 | 43,205,547 |
Income Before Other Income (Expense) | 2,952,494 | 3,227,636 | 4,444,469 | 4,344,434 | 4,563,916 | 4,177,017 | 4,579,147 | 3,951,687 | 14,969,033 | 17,271,767 | 14,918,372
Other Expenses | (3,922,516) | (3,666,920) | (2,979,418) | (2,975,651) | (2,665,403) | (2,793,038) | (2,814,903) | (2,451,171) | (13,544,505) | (10,724,515) | (10,749,282)
Net (Loss) Income | $ (970,022) | $ (439,284) | $ 1,465,051 | $ 1,368,783 | $ 1,898,513 | $ 1,383,979 | $ 1,764,244 | $ 1,500,516 | $ 1,424,528 | $ 6,547,252 | $ 4,169,090
Net Income per Unit before Discontinued Operations | $ / shares | $ (7.95) | $ (3.61) | $ 12.03 | $ 11.23 | $ 15.55 | $ 11.32 | $ 14.40 | $ 12.21 | $ 11.70 | $ 53.48 |
Net (Loss) Income per Unit (in dollars per unit) | $ / shares | $ (7.95) | $ (3.61) | $ 12.03 | $ 11.23 | $ 15.55 | $ 11.32 | $ 14.40 | $ 12.21 | $ 11.70 | $ 53.48 | $ 33.52
Income Per Depositary Receipt Before Discontinued Operations (in dollars per unit) | $ / item | (0.27) | (0.12) | 0.40 | 0.37 | 0.51 | 0.38 | 0.48 | 0.41 | 0.39 | 1.78 |
Net Income Per Depositary Receipt (in dollars per receipt) | $ / item | (0.27) | (0.12) | 0.40 | 0.37 | 0.51 | 0.38 | 0.48 | 0.41 | 0.39 | 1.78 |

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