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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Current Assets:    
Allowance for doubtful accounts $ 296,276 $ 356,253
Stockholders' equity    
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common stock, shares authorized 8,000,000 8,000,000
Common stock, shares issued 4,893,548 4,881,548
Common stock, shares outstanding 4,893,548 4,881,548
Treasury stock, at cost 40,920 40,920
Preferred stock, par value (usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares outstanding 0 0