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Note 5 - Operating Lease Right-of-use Asset, Net (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Remainder of 2022

  $ 114  

2023

    471  

2024

    485  

2025

    499  

2026

    514  

2027

    44  

Total undiscounted lease payments

    2,127  

Less imputed interest

    425  

Total operating lease liabilities

  $ 1,702