| Quarterly Financial Information [Table Text Block] |
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| | $ | 17,573,001 | | | $ | 14,273,252 | | | $ | 16,196,110 | | | $ | 11,898,103 | | Income before income taxes | | $ | 16,081,359 | | | $ | 13,099,676 | | | $ | 15,103,470 | | | $ | 10,802,414 | | |
| | $ | 10,906,970 | | | $ | 8,929,412 | | | $ | 10,123,117 | | | $ | 7,280,051 | | Net income per Sub-share Certificate | | $ | 1.37 | | | $ | 1.12 | | | $ | 1.26 | | | $ | .90 | | | |
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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 | | |