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Consolidated Balance Sheets (Parentheticals) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
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) 7,613,338 7,613,338
Common stock, shares outstanding (in shares) 6,613,338 6,613,338
Treasury stock, par value $ 0.001 $ 0.001
Treasury stock, shares (in shares) 1,000,000 1,000,000