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Note 7 - Annual Maturities of Long-Term Debt and Finance Leases (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Annual Maturities Of Long Term Debt [Abstract]  
Q4 2019 $ 2
2020 1
2021 88
2022 2
2023 1
2024 and thereafter 14
Total 108
Q4 2019 2
2020 1
2021 113
2022 2
2023 1
2024 and thereafter 14
Total $ 133