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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Financial Position [Abstract]      
Allowance for doubtful accounts $ 929,294 $ 622,687 $ 592,458
Property and equipment, accumulated depreciation 31,657,385 27,508,397 23,518,164
Intangible assets, accumulated amortization $ 825,639 $ 434,318 $ 101,222
Preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000,000 1,000,000 1,000,000
Preferred stock, shares issued 0 0 0
Common stock, par value $ 0.01 $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000 30,000,000
Common stock, shares issued 16,563,469 16,207,268 15,890,083
Common stock, shares outstanding 14,904,845 14,548,277 14,688,759
Treasury stock, shares outstanding 1,658,991 1,658,991 1,201,324