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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

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