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Note 8 - Leases - Lease Terms and Discount Rates for Lease Liabilities (Details) | Dec. 31, 2021 | Dec. 31, 2020
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Finance leases, weighted-average remaining lease term (Year) | 3 years 6 months 21 days | 3 years 8 months 1 day
Operating leases, weighted-average remaining lease term (Year) | 18 years 5 months 1 day | 18 years 2 months 15 days
Finance leases, weighted-average discount rate | 5.10% | 5.22%
Operating leases, weighted-average discount rate | 2.18% | 3.36%

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