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6) Earnings Per Share: Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share Table Text Block (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Details        
Net earnings $ 2,799,245 $ 3,593,032 $ 4,832,511 $ 5,255,215
Weighted-average Class A equivalent common share outstanding (1) 11,046,283 10,059,155 10,991,303 10,036,975
GrantOfEmployeeStockOptions $ 806,657 $ 379,602 $ 845,805 $ 175,151
Pro Forma Weighted Average Shares Outstanding, Diluted 806,657 379,602 845,805 175,151
Weighted-average Class A equivalent common shares outstanding-assuming dilution (1) 11,852,940 10,438,757 11,837,108 10,212,126
Net earnings per Class A Equivalent common share (1) $ 0.25 $ 0.36 $ 0.44 $ 0.52
Net earnings per Class A Equivalent common share-assuming dilution (1) $ 0.24 $ 0.34 $ 0.41 $ 0.51