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Fair Value (Tables)
 3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Fair Value Assets and Liabilities at March 31 2013
(in thousands) Level 1   Level 2   Level 3 Total  
Assets        
  Marketable equity securities $5,683  $      -    $-    $5,683 
Liabilities        
  RMB warrants -    1,039  -    1,039 
Fair Value Assets and Liabilities December 2012
(in thousands) Level 1   Level 2   Level 3 Total  
Assets        
  Marketable equity securities $7,093  $      -    $-    $7,093 
Liabilities        
  RMB warrants -    1,138  -    1,138