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Note 5 - Estimated Future Amortization Expense Related to Intangible Assets (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Intangible Assets Gross Excluding Goodwill [Abstract]  
Q4 2020 $ 1
2021 5
2022 5
2023 4
2024 4
2025 and thereafter 3
Intangible Assets Net $ 22