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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Current Assets:    
Allowance for doubtful accounts $ 211,000 $ 208,000
Allowance for reserve $ 39,000 $ 39,000
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 5,225,648 5,214,148
Common stock, shares outstanding 5,080,395 5,088,815
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