| Quarterly Financial Information [Text Block] |
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Selected Quarterly Financial Data (Unaudited)
| The following tables present unaudited financial data of the Trust for each quarter of 2014 and 2013: Ìý | Ìý |
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| Ìý | $ | 13,295,068 | Ìý | Ìý | $ | 14,756,468 | Ìý | Ìý | $ | 15,583,264 | Ìý | Ìý | $ | 11,581,953 | Ìý | Income before income taxes | Ìý | $ | 12,200,547 | Ìý | Ìý | $ | 13,878,547 | Ìý | Ìý | $ | 14,712,912 | Ìý | Ìý | $ | 10,639,548 | Ìý | |
| Ìý | $ | 8,234,892 | Ìý | Ìý | $ | 9,366,043 | Ìý | Ìý | $ | 9,914,167 | Ìý | Ìý | $ | 7,249,918 | Ìý | Net income per Sub-share Certificate | Ìý | $ | 0.99 | Ìý | Ìý | $ | 1.11 | Ìý | Ìý | $ | 1.17 | Ìý | Ìý | $ | 0.86 | Ìý | Ìý Ìý | Ìý |
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| Ìý | $ | 12,503,683 | Ìý | Ìý | $ | 14,936,609 | Ìý | Ìý | $ | 9,953,933 | Ìý | Ìý | $ | 6,726,854 | Ìý | Income before income taxes | Ìý | $ | 11,145,275 | Ìý | Ìý | $ | 14,103,915 | Ìý | Ìý | $ | 9,049,678 | Ìý | Ìý | $ | 5,843,710 | Ìý | |
| Ìý | $ | 7,519,106 | Ìý | Ìý | $ | 9,431,118 | Ìý | Ìý | $ | 6,130,440 | Ìý | Ìý | $ | 4,137,844 | Ìý | Net income per Sub-share Certificate | Ìý | $ | 0.88 | Ìý | Ìý | $ | 1.10 | Ìý | Ìý | $ | 0.71 | Ìý | Ìý | $ | 0.47 | Ìý |
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