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Note 5 - Operating Lease Right-of-use Asset, Net (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]

Remainder of 2023

  $ 236  

2024

    485  

2025

    499  

2026

    514  

2027

    44  

Total undiscounted lease payments

  $ 1,778  

Less imputed interest

    300  

Total operating lease liabilities

  $ 1,478