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Income Taxes (Details 2) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Allowance for doubtful accounts $ 406,387 $ 335,624
Other assets 817,880 547,327
Accrued expenses 519,447 485,506
Other Long - term Liabilities 381,380 426,203
Stock-based compensation 347,493 425,699
Net operating losses 382,852 638,858
Subtotal 2,855,439 2,859,217
Valuation allowance (643,552) (653,919)
Total 2,211,887 2,205,298
Deferred tax liabilities:    
Prepaid expenses (506,933) (674,314)
Property and equipment (1,427,035) (1,561,300)
Intangibles (49,308,526) (45,126,386)
Total (51,242,494) (47,362,000)
Net deferred tax liabilities $ (49,030,607) $ (45,156,702)