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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 3,534,000 $ 2,723,000
Property and equipment, accumulated depreciation 43,201,512 41,486,000
Intangible assets, accumulated amortization $ 11,390,000 $ 5,864,000
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 17,336,314 17,152,743
Common stock, shares outstanding 15,677,323 15,493,752
Treasury stock, shares outstanding 1,658,991 1,658,991