| Schedule of Quarterly Financial Information [Table Text Block] |
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| | $ | 14,721,058 | | | $ | 18,186,748 | | | $ | 11,795,134 | | | $ | 34,739,353 | | Income before income taxes | | $ | 13,345,170 | | | $ | 17,233,208 | | | $ | 10,949,033 | | | $ | 33,755,611 | | |
| | $ | 8,995,057 | | | $ | 11,461,349 | | | $ | 7,416,012 | | | $ | 22,166,089 | | Net income per Sub-share Certificate | | $ | 1.10 | | | $ | 1.40 | | | $ | 0.90 | | | $ | 2.67 | | | |
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| | $ | 13,295,068 | | | $ | 14,756,468 | | | $ | 15,583,264 | | | $ | 11,581,953 | | Income before income taxes | | $ | 12,200,547 | | | $ | 13,878,547 | | | $ | 14,712,912 | | | $ | 10,639,548 | | |
| | $ | 8,234,892 | | | $ | 9,366,043 | | | $ | 9,914,167 | | | $ | 7,249,918 | | Net income per Sub-share Certificate | | $ | 0.99 | | | $ | 1.11 | | | $ | 1.17 | | | $ | 0.86 | | |