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Note 9 - Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
   
March 31,
2021
 
Remainder of 2021
  $
328
 
2022
   
53
 
Total lease payments
   
381
 
Less present value discount
   
(7
)
Present value of lease liabilities
  $
374