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Note 6 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Year Ending December 31,

    

Remainder of 2020

 $1,175 

2021

  2,401 

2022

  2,472 

2023

  2,543 

2024

  2,614 

Thereafter

  4,227 

Total future minimum lease payments

  15,432 

Less: amount representing interest

  3,201 

Present value of future lease payments

  12,231 

Less: short-term lease liabilities

  1,495 

Long-term lease liabilities

 $10,736