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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Current Assets:    
Allowance for doubtful accounts $ 230,749 $ 233,851
Stockholders' equity    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 8,000,000 8,000,000
Common stock, shares issued (in shares) 4,826,182 4,826,182
Treasury shares (in shares) 40,920 40,920