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Note 3 - Fair Value Measurements
9 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
3.
Fair Value Measurements
 
Below is a summary of assets and liabilities measured at fair value (in thousands):
 
    As of September 30, 2017
    Quoted Prices
in Active
Markets
(Level 1)
  Significant
Observable
Inputs
(Level 2)
  Significant
Unobservable
Inputs
(Level 3)
  Total
Assets                
Cash equivalents   $
11,297
    $
-
    $
-
    $
11,297
 
Government securities    
27,444
     
-
     
-
     
27,444
 
Total   $
38,741
    $
-
    $
-
    $
38,741
 
 
    As of December 31, 2016
    Quoted Prices
in Active
Markets
(Level 1)
  Significant
Observable
Inputs
(Level 2)
  Significant
Unobservable
Inputs
(Level 3)
  Total
Assets                
Cash equivalents   $
28,876
    $
-
    $
-
    $
28,876
 
Government securities    
4,925
     
-
     
-
     
4,925
 
Total   $
33,801
    $
-
    $
-
    $
33,801
 
 
As of
September 30, 2017
and
December 31, 2016,
the Company’s cash equivalents consist principally of money market funds with original maturities of
90
days or less.
 
Available-for-sale securities consist of the following (in thousands):
 
    Amortized Cost   Unrealized Gains   Unrealized Losses   Fair Value
September 30, 2017                                
Government securities                                
(Due within 1 year)   $
27,450
    $
1
    $
(7
)   $
27,444
 
    $
27,450
    $
1
    $
(7
)   $
27,444
 
                                 
December 31, 2016                                
Government securities                                
(Due within 1 year)   $
4,924
    $
1
    $
-
    $
4,925
 
    $
4,924
    $
1
    $
-
    $
4,925