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Consolidated Balance Sheets (Parentheticals) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts (in Dollars) (in Dollars) $ 87,000 $ 92,000
Reserve for obsolescence (in Dollars) (in Dollars) $ 5,108,000 $ 4,233,000
Preferred stock, par value (in Dollars per share) (in Dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in Shares) (in Shares) 5,000,000 5,000,000
Preferred stock, shares issued (in Shares) (in Shares) 0 0
Preferred stock, shares outstanding (in Shares) (in Shares) 0 0
Common Class A [Member]
    
Common stock par value (in Dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in Shares) 20,000,000 20,000,000
Common stock, shares issued (in Shares) 4,777,144 4,777,144
Common stock, shares outstanding (in Shares) 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 (in Shares) 762,612 762,612
Common stock, shares issued (in Shares) 762,612 762,612
Common stock, shares outstanding (in Shares) 762,612 762,612