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Note 9 - Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ending December 31,
 
Amount
 
2018 (remaining three months)
  $
357
 
2019
   
1,659
 
2020
   
1,813
 
2021
   
1,654
 
2022
   
1,483
 
2023 and thereafter
   
4,799
 
Total future minimum lease payments
  $
11,765