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13) Acquisitions: Unaudited pro forma (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Details    
ProForma Revenues $ 54,852,234 $ 47,323,230
ProForma Net Earnings 2,033,266 1,662,185
ProForma Net Earnings per Class A equivalent common share $ 0.19 $ 0.17
ProForma Net Earnings per Class A equivalent common share assuming dilution $ 0.17 $ 0.16