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Note 4 - Select Balance Sheet Details (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Fiscal Year Ended December 31,

 

Estimated

Amortization

Expense

($ in thousands)

 

2021 (three months)

 $3 

2022

  12 

2023

  12 

2024

  12 

2025

  10 

Total

 $49