Quarterly report pursuant to Section 13 or 15(d)

Marketable securities (Details)

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Marketable securities (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Marketable securities    
Cost $ 0 $ 4,422,000
Marketable securities    
Cost 0 4,422,000
Market value   4,411,000
Unrealized (loss)   (11,000)
Cost of investments by fiscal maturity    
Due in one year or less   4,422,000
Estimated fair value of investments by fiscal maturity    
Due in one year or less   4,411,000
Certificates of deposit
   
Marketable securities    
Cost   4,422,000
Marketable securities    
Cost   4,422,000
Market value   4,411,000
Unrealized (loss)   $ (11,000)