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Note 9 - Annual Maturities of Long-Term Debt and Finance Leases (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Annual Maturities Of Long Term Debt [Abstract]  
2021 $ 2
2022 2
2023 1
2024 1
2025 1
2026 and thereafter 12
Total 19
2021 2
2022 2
2023 1
2024 1
2025 1
2026 and thereafter 12
Total $ 19