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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
11.  Valuation and Qualifying Accounts
 
A summary of the activity in the Company's valuation and qualifying accounts is as follows:
 
 
Description
 
Balance at
Beginning of
Period
  
Charged to
Costs and
Expenses
  
Write-off's
  
Other
Changes
  
Balance at
End of
Period
 
Deferred tax asset valuation allowance
               
                 
Year ended December 31, 2011
 $4,316,275   138,298   -   -  $4,454,573 
Year ended December 31, 2010
 $4,314,909   1,366   -   -  $4,316,275