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Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net income attributable to common shareholders	$ 1,869,494	$ 1,847,412	$ 4,036,992	$ 4,746,191
Denominator:
Weighted-average shares outstanding -basic	19,432,715	20,327,537	19,737,216	20,414,593
Dilutive effect of other securities	238,026	207,110	231,835	242,974
Weighted-average shares outstanding, diluted	19,670,741	20,534,647	19,969,051	20,657,567

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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