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Note 1 - Basis of Presentation (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
   
As
P
reviously
R
eported
    
Lease
Standard
Adjustment
    
As
Adjusted
  
Other noncurrent assets
   $
82
     $
805
     $
887
  
Prepaid expenses and other current assets
    
2,429
      
(61
 )    
2,368
  
Accrued expenses and other current liabilities
    
3,534
      
439
      
3,973
  
Other noncurrent liabilities
    
32
      
376
      
408
  
Accumulated deficit
    
(57,964
 )    
(71
 )    
(58,035
 )