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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts $ 299,085 $ 233,851
Stockholders' equity    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 8,000,000 8,000,000
Common Stock, Shares, Issued 4,826,182 4,826,182
Common Stock, Shares, Outstanding 4,826,182 4,826,182
Treasury stock, at cost 40,920 40,920
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares outstanding 0 0