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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts, trade accounts receivable (in dollars) $ 130 $ 130
Preferred stock, par value (In dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued 0 0
Common Stock Class A
    
Common stock, par value (In dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 35,000 35,000
Common stock, shares issued 1,574 1,574
Common stock, shares outstanding 1,574 1,574
Common Stock Class B
    
Common stock, par value (In dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 200,000 200,000
Common stock, shares issued 21,412 21,382
Common stock, shares outstanding 21,396 21,382
Treasury stock, shares 16