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Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Allowance for doubtful accounts (in Dollars) $ 152 $ 336
Accumulated depreciation (in Dollars) $ 100,638 $ 97,883
Preferred stock, par value (in Dollars per share) (in Dollars per share)      
Preferred stock, shares authorized (in Shares) 15,000 15,000
Preferred stock, shares outstanding (in Shares) 0 0
Common Class A [Member]
    
Common stock, par value (in Dollars per share)      
Common stock, shares authorized (in Shares) 100,000 100,000
Common stock, shares issued (in Shares) 23,262 22,916
Common stock, shares outstanding (in Shares) 23,262 22,916
Common Class B [Member]
    
Common stock, par value (in Dollars per share)      
Common stock, shares authorized (in Shares) 25,000 25,000
Common stock, shares issued (in Shares) 2,562 2,762
Common stock, shares outstanding (in Shares) 2,562 2,762