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13) Acquisitions: Unaudited pro forma (Details) (USD $)
 6 Months Ended
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)