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Schedule II - Valuation and Qualifying Accounts (Details) - Valuation and Qualifying Accounts (Valuation Allowance of Deferred Tax Assets [Member], USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Valuation Allowance of Deferred Tax Assets [Member]
      
Valuation Allowance [Line Items]      
Balance at Beginning Of Period $ 27,591,230 $ 27,576,253 $ 27,091,338
Charged to Costs and Expenses 796,237 888,561 1,160,405
Deductions (1,112,961) [1] (873,584) [1] (675,490) [1]
Balance at End Of Period $ 27,274,506 $ 27,591,230 $ 27,576,253
[1] Deductions represent the effect of expiring NOL carryforwards from prior years.