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Condensed Consolidated Balance Sheets (Parentheticals) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Allowance for doubtful accounts (in Dollars) $ 97,000 $ 96,000
Reserve for obsolescence (in Dollars) $ 4,011,000 $ 3,700,000
Preferred stock, par value (in Dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common Class A [Member]
    
Common stock par value (in Dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares issued 4,777,144 4,777,144
Common stock, shares outstanding 4,777,144 4,777,144
Common Class B [Member]
    
Common stock par value (in Dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 762,612 762,612
Common stock, shares issued 762,612 762,612
Common stock, shares outstanding 762,612 762,612