| Schedule of Quarterly Financial Information [Table Text Block] |
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Quarter ended
|
|
|
|
|
December 31,
2013
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|
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September 30,
2013
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|
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June 30,
2013
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March 31,
2013
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|
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Income
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|
$
|
12,503,683
|
|
|
$
|
14,936,609
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|
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$
|
9,953,933
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|
$
|
6,726,854
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Income before income taxes
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|
$
|
11,145,275
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|
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$
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14,103,915
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|
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$
|
9,049,678
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$
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5,843,710
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Net income
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$
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7,519,106
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$
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9,431,118
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$
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6,130,440
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$
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4,137,844
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Net income per Sub-share Certificate
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$
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0.88
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$
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1.10
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$
|
0.71
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|
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$
|
0.47
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Quarter ended
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|
|
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|
December 31,
2012
|
|
|
September 30,
2012
|
|
|
June 30,
2012
|
|
|
March 31,
2012
|
|
|
Income
|
|
$
|
7,276,793
|
|
|
$
|
7,043,281
|
|
|
$
|
8,706,738
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|
|
$
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9,580,079
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Income before income taxes
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|
$
|
6,218,508
|
|
|
$
|
6,369,983
|
|
|
$
|
7,956,109
|
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$
|
8,778,286
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Net income
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|
$
|
4,113,797
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|
|
$
|
4,311,092
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|
$
|
5,284,674
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$
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5,938,255
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Net income per Sub-share Certificate
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$
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0.47
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$
|
0.48
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$
|
0.59
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$
|
0.65
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