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Note 4 - Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
        Fair Value Measurements at Reporting Date Using
    December 31, 2017   Quoted Prices in
Active Markets
 for Identical Assets 
 (Level 1)		   Significant Other
 Observable Inputs 
 (Level 2)		   Significant
 Unobservable Inputs 
 (Level 3)
Cash equivalents:                                
Money market fund   $
5,893
     $
5,893
     $
-
     $
-
  
Bank certificates of deposit    
500
      
-
      
500
      
-
  
Total cash equivalents   $
6,393
     $
5,893
     $
500
     $
-
  
                                 
Investments:                                
Bank certificates of deposit   $
24,000
     $
-
     $
24,000
     $
-
  
        Fair Value Measurements at Reporting Date Using
    December 31, 2016   Quoted Prices in
Active Markets
 for Identical Assets
 (Level 1)		   Significant Other
 Observable Inputs
 (Level 2)		   (Level 3)
Cash equivalents:                                
Money market funds   $
68,352
     $
-
     $
68,352
     $
-
  
Bank certificates of deposit    
750
      
-
      
750
      
-
  
Total cash equivalents   $
69,102
     $
-
     $
69,102
     $
-
  
                                 
Investments:                                
Bank certificates of deposit    
20,500
      
-
      
20,500
      
-
  
Total investments   $
20,500
     $
-
     $
20,500
     $
-