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Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator
Net income attributable to common shareholders	$ 1,744,290	$ 2,177,619	$ 2,167,498	$ 2,898,779
Denominator
Weighted-average shares outstanding -basic	19,771,167	20,471,621	19,889,583	20,458,842
Dilutive effect of other securities	225,638	190,098	227,663	260,872
Weighted Average Number of Shares Outstanding, Diluted, Total	19,996,805	20,661,719	20,117,246	20,719,714

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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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