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Note 6 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
             
   
March 31, 2018
   
December 31, 2017
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Level 1
   
Level 2
   
Level 3
 
Financial Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash and cash equivalents
                                               
Money market mutual fund
  $
1,115
    $
-
    $
-
    $
3,034
    $
-
    $
-
 
Total
  $
1,115
    $
-
    $
-
    $
3,034
    $
-
    $
-