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Supplemental Disclosure to Cash Flows (Tables)
12 Months Ended
Dec. 31, 2012
Supplemental Disclosure to Cash Flows [Abstract]  
Summary of supplemental non-cash and other cash flow information
                         
    2012     2011     2010  

Cash paid for income taxes—net

  $ 1,079,022     $ 51,864     $ 703,982  

Non Cash Transactions

                       

Property and equipment purchases in accounts payable

  $ 112,752     $ 80,618     $ 156,213  

Purchase of assets under capital lease obligations

    146,967       —          —     

Reversal of tax benefit from stock options forfeited

    —          —          329,143