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Note 9 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ending December 31,
 
Amount
 
2018 (remaining six months)
  $
718
 
2019
   
1,307
 
2020
   
1,374
 
2021
   
1,291
 
2022
   
1,061
 
2023 and thereafter
   
4,264
 
Total future minimum lease payments
  $
10,015