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Note 9 - Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Assets
  
Total
    
Quoted
Prices in
Active
Markets
for
Identical
Assets
(Level 1)
    
Significant
Other
Observable
Inputs
(Level 2)
    
Significant
Unobservable
Inputs
(Level 3)
  
Money market mutual funds
   $
26,456
     $
26,456
     $
—
     $
—
  
Assets
  
Total
    
Quoted
Prices in
Active
Markets
for
Identical
Assets
(Level 1)
    
Significant
Other
Observable
Inputs
(Level 2)
    
Significant
Unobservable
Inputs
(Level 3)
  
Money market mutual funds
   $
26,371
     $
26,371
     $
—
     $
—