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Note 5 - Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
June 30, 2017
    
December 31, 2016
  
(in thousands)
  
Level 1
    
Level 2
    
Level 3
    
Level 1
    
Level 2
    
Level 3
  
Financial Assets:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
                                                
Money market mutual fund
   $
16,655
     $
-
     $
-
     $
11,771
     $
-
     $
-
  
Total
   $
16,655
     $
-
     $
-
     $
11,771
     $
-
     $
-