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Note 6 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ended December 31:
       
2019
  $
3,195
 
2020
   
2,722
 
2021
   
2,801
 
2022
   
2,883
 
2023
   
2,967
 
Thereafter
   
3,274
 
Total future minimum lease payments
  $
17,842