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Note 6 - Operating Lease Right-of-use Asset, Net (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
   
Operating Lease
 
   
September 30, 2020
 
Remainder of 2020
  $
158
 
For the year ending December 31, 2021
   
649
 
Total undiscounted lease payments
   
807
 
Less imputed interest
   
54
 
Total operating lease liabilities
  $
753