| Schedule of Quarterly Financial Information [Table Text Block] |
|
Ìý
|
Ìý
|
Quarter
ended
|
Ìý
|
|
Ìý
|
Ìý
|
|
Ìý
|
Ìý
|
|
Ìý
|
Ìý
|
|
Ìý
|
Ìý
|
|
Ìý
|
|
Income
|
Ìý
|
$
|
7,276,793
|
Ìý
|
Ìý
|
$
|
7,043,281
|
Ìý
|
Ìý
|
$
|
8,706,738
|
Ìý
|
Ìý
|
$
|
9,580,079
|
Ìý
|
|
Income
before income taxes
|
Ìý
|
$
|
6,218,508
|
Ìý
|
Ìý
|
$
|
6,369,983
|
Ìý
|
Ìý
|
$
|
7,956,109
|
Ìý
|
Ìý
|
$
|
8,778,286
|
Ìý
|
|
Net
income
|
Ìý
|
$
|
4,113,797
|
Ìý
|
Ìý
|
$
|
4,311,092
|
Ìý
|
Ìý
|
$
|
5,284,674
|
Ìý
|
Ìý
|
$
|
5,938,255
|
Ìý
|
|
Net
income per Sub-share Certificate
|
Ìý
|
$
|
0.47
|
Ìý
|
Ìý
|
$
|
0.48
|
Ìý
|
Ìý
|
$
|
0.59
|
Ìý
|
Ìý
|
$
|
0.65
|
Ìý
|
|
Ìý
|
Ìý
|
Quarter
ended
|
Ìý
|
|
Ìý
|
Ìý
|
|
Ìý
|
Ìý
|
|
Ìý
|
Ìý
|
|
Ìý
|
Ìý
|
|
Ìý
|
|
Income
|
Ìý
|
$
|
11,239,562
|
Ìý
|
Ìý
|
$
|
8,560,379
|
Ìý
|
Ìý
|
$
|
8,798,987
|
Ìý
|
Ìý
|
$
|
5,720,108
|
Ìý
|
|
Income
before income taxes
|
Ìý
|
$
|
10,009,760
|
Ìý
|
Ìý
|
$
|
7,848,114
|
Ìý
|
Ìý
|
$
|
8,012,551
|
Ìý
|
Ìý
|
$
|
4,885,493
|
Ìý
|
|
Net
income
|
Ìý
|
$
|
6,560,335
|
Ìý
|
Ìý
|
$
|
5,258,936
|
Ìý
|
Ìý
|
$
|
5,415,929
|
Ìý
|
Ìý
|
$
|
3,359,569
|
Ìý
|
|
Net
income per Sub-share Certificate
|
Ìý
|
$
|
0.71
|
Ìý
|
Ìý
|
$
|
0.56
|
Ìý
|
Ìý
|
$
|
0.58
|
Ìý
|
Ìý
|
$
|
0.35
|
Ìý
|
|