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Note 9 - Leases (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Lease, Cost [Table Text Block]
   

Three Months Ended

   

Nine Months Ended

 
   

September 30,

   

September 30,

 
   

2021

   

2020

   

2021

   

2020

 

Lease expense

                               

Operating lease expense

  $ 3     $ 3     $ 9     $ 9  

Short-term lease expense

    1       -       2       1  

Total lease expense

  $ 4     $ 3     $ 11     $ 10  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Year ending December 31,

 

Operating Leases

 

Remainder of 2021

  $ 3  

2022

    11  

2023

    9  

2024

    9  

2025

    8  

Thereafter

    43  

Total lease payments

    83  

Less: Imputed interest

    (24 )

Present value of lease liabilities

  $ 59