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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Supplemental Cash Flow Information |
Schedule of cash paid for interest and income taxes |
|  | Years Ended December 31 |
|  | 2012 |  | 2011 |  | 2010 |
Interest |  | $ | 57,669 |  | $ | 126,999 |  | $ | 127,378 |
Income taxes, net of refunds |  | $ | 4,960,408 |  | $ | 3,793,454 |  | $ | 5,522,702 |

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