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Note 10 - Leases (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Year Ending December 31,    
2023 (remaining six months)  159 
2024  319 
2025  319 
2026  106 
Total  903 
Less: imputed interest  (98)
Total lease liability  

805

 
Less current portion  (262)
Non-current lease liability $543 
Schedule of Change in Asset Retirement Obligation [Table Text Block]
  

Six months ended June 30,

 
  

2023

  2022 

Beginning balance

 $657  $624 

Accretion of discount

  17   16 

Change in ARO estimate due to lease modification

  (15

)

  - 

Ending Balance

 $659  $640