Schedule of Quarterly Financial Information [Table Text Block] |
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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 | |
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| | $ | 12,503,683 | | | $ | 14,936,609 | | | $ | 9,953,933 | | | $ | 6,726,854 | | Income before income taxes
| | $ | 11,145,275 | | | $ | 14,103,915 | | | $ | 9,049,678 | | | $ | 5,843,710 | |
| | $ | 7,519,106 | | | $ | 9,431,118 | | | $ | 6,130,440 | | | $ | 4,137,844 | | Net income per Sub-share Certificate
| | $ | 0.88 | | | $ | 1.10 | | | $ | 0.71 | | | $ | 0.47 | |
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