Quarterly report pursuant to Section 13 or 15(d)

Marketable securities (Details)

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Marketable securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Marketable securities    
Cost $ 4,597 $ 5,394
Market value 4,585 5,375
Unrealized (loss) (12) (19)
Cost of investments by rolling maturity    
Due in one year or less 4,597  
Estimated fair value of investments by rolling maturity    
Due in one year or less 4,585  
Cost of investments by fiscal maturity    
Due in one year or less   5,394
Estimated fair value of investments by fiscal maturity    
Due in one year or less   5,375
Certificates of deposit
   
Marketable securities    
Cost 4,597 5,394
Market value 4,585 5,375
Unrealized (loss) $ (12) $ (19)