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13) Acquisitions: Unaudited pro forma (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Details        
ProForma Revenues $ 61,332,289 $ 56,529,818 $ 116,184,523 $ 103,859,760
ProForma Net Earnings 2,799,245 3,593,272 4,832,511 5,256,652
ProForma Net Earnings per Class A equivalent common share $ 0.25 $ 0.36 $ 0.44 $ 0.55
ProForma Net Earnings per Class A equivalent common share assuming dilution $ 0.24 $ 0.34 $ 0.41 $ 0.54