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TREASURY UNITS (Details) |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 132 Months Ended | 142 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 10, 2015 shares | Aug. 31, 2007 $ / item shares | Aug. 20, 2007 shares | Sep. 30, 2007 $ / item shares | Aug. 31, 2020 shares | Mar. 31, 2019 $ / item shares | Dec. 31, 2007 $ / item shares | Jun. 30, 2020 USD ($) $ / item shares | Jun. 30, 2019 USD ($) $ / item shares | Dec. 31, 2018 $ / item shares | Jun. 30, 2019 USD ($) $ / item | Mar. 06, 2008 shares
Treasury units |  |  |  |  |  |  |  | 58,469 |  |  |  |
Period for repurchase of depository receipts | 5 years |  | 12 months |  |  |  |  |  |  |  |  |
Depository receipts authorized to be repurchased | 2,000,000 |  | 300,000 |  |  |  |  |  |  |  |  | 1,500,000
Number of depository receipts repurchased |  | 1,428,437 |  | 1,428,437 |  |  | 1,428,437 |  | 1,428,437 | 1,428,437 |  |
Repurchase price of depository receipts (in dollars per receipt) | $ / item |  |  |  |  |  |  |  |  |  |  | 28.43 |
Units required to be repurchased (in shares) |  |  |  |  |  |  |  | 222 | 1,995 |  |  |
Total cost of repurchase | $ |  |  |  |  |  |  |  | $ 394,031 | $ 3,305,651 |  | $ 44,718,000 |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased |  |  |  |  | 0 |  |  |  |  |  |  |
General Partnership |  |  |  |  |  |  |  |  |  |  |  |
Treasury units |  |  |  |  |  |  |  | 585 |  |  |  |
Fixed distribution percentage of unit holders |  |  |  |  |  |  |  | 1.00% |  |  |  |
Number of depository receipts repurchased |  | 188 |  | 188 |  | 188 |  |  |  | 188 |  |
Total cost of repurchase | $ |  |  |  |  |  |  |  | $ 3,941 | $ 33,055 |  |  |
Value of units required to be repurchased | $ |  |  |  |  |  |  |  | $ 3,939 |  |  |  |
Repurchases required (in units) |  |  |  |  |  |  |  | 2.22 |  |  |  |
Treasury Units |  |  |  |  |  |  |  |  |  |  |  |
Units required to be repurchased (in shares) |  |  |  |  |  |  |  | 222 | 1,995 |  |  |
Class A |  |  |  |  |  |  |  |  |  |  |  |
Treasury units |  |  |  |  |  |  |  | 46,775 |  |  |  |
Fixed distribution percentage of unit holders |  |  |  |  |  |  |  | 80.00% |  |  |  |
Repurchase price of units (in dollars per unit) | $ / item |  | 852.90 |  | 852.90 |  | 852.90 |  |  |  | 852.90 |  |
Total cost of repurchase | $ |  |  |  |  |  |  |  | $ 315,220 | $ 2,644,552 |  |  |
Class B |  |  |  |  |  |  |  |  |  |  |  |
Treasury units |  |  |  |  |  |  |  | 11,109 |  |  |  |
Fixed distribution percentage of unit holders |  |  |  |  |  |  |  | 19.00% |  |  |  |
Number of depository receipts repurchased |  | 3,572 |  | 3,572 |  | 3,572 |  |  |  | 3,572 |  |
Total cost of repurchase | $ |  |  |  |  |  |  |  | $ 74,870 | $ 628,044 |  |  |
Class B |  |  |  |  |  |  |  |  |  |  |  |
Value of units required to be repurchased | $ |  |  |  |  |  |  |  | $ 74,839 |  |  |  |
Class B | General Partnership |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price of units (in dollars per unit) | $ / item |  | 1,033.00 |  | 1,033.00 |  |  | 1,033.00 |  | 1,033.00 | 1,033.00 |  |
Repurchases required (in units) |  |  |  |  |  |  |  | 42.18 |  |  |  |
Treasury Units |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price of depository receipts (in dollars per receipt) | $ / item |  |  |  |  |  |  |  | 59.14 |  |  |  |
Units required to be repurchased (in shares) |  |  |  |  |  |  |  | 5,328 |  |  |  |
Repurchase price of units (in dollars per unit) | $ / item |  |  |  |  |  |  |  | 1,774.20 |  |  |  |
Total cost of repurchase | $ |  |  |  |  |  |  |  | $ 315,216 |  |  |  |

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