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Note 8 - Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
Total
   
Quoted Prices in
Active Markets for
Identical Assets
 (Level 1)
   
Significant Other
Observable Inputs
 (Level 2)
   
Significant
Unobservable Inputs
(Level 3)
  
   
(in thousands)
 
Cash equivalents:
                       
Money market accounts
  $ 40,013     $ 40,013     $ —     $ —  
Restricted short-term investments:
                               
Certificates of deposit
    1,495       1,495       —       —  
                                 
Fair value measurement as of September 30, 2014
  $ 41,508     $ 41,508     $ —     $ —  
                         
Cash equivalents:
                       
Money market accounts
  $ 41,183     $ 41,183     $ —     $ —  
Restricted short-term investments:
                               
Certificates of deposit
    1,325       1,325       —       —  
                                 
Fair value measurement as of December 31, 2013
  $ 42,508     $ 42,508     $ —     $ —