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Note 8 - Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ending December 31,
 
 
 
 
2018 (remaining 9 months)
  $
632
 
2019
   
681
 
2020
   
18
 
2021
   
—
 
2022 and beyond
   
—
 
Total
  $
1,331