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13) Acquisitions: Unaudited pro forma (Details) (USD $) | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011
ProForma Revenues | $ 103,859,760 | $ 70,666,913
ProForma Net Earnings | 5,256,652 | (302,965)
ProForma Net Earnings per Class A equivalent common share | $ 0.55 |
ProForma Net Earnings per Class A equivalent common share assuming dilution | $ 0.54 | $ (0.03)

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