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Valuation and Qualifying Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts (deducted from accounts receivable) [Member]
    
VALUATION AND QUALIFYING ACCOUNTS    
Balance at Beginning of Period $ 454,632 $ 907,819
Charged to Costs and Expenses 1,219,698 1,164,058
Deductions 1,036,470 1,617,245
Balance at End of Period 637,860 454,632
Valuation allowance for deferred tax assets [Member]
    
VALUATION AND QUALIFYING ACCOUNTS    
Balance at Beginning of Period 653,919 594,366
Charged to Costs and Expenses 1,940 74,665
Deductions 12,307 15,112
Balance at End of Period $ 643,552 $ 653,919