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Note 5 - Financing Arrangements - Long-term Debt (Details) (Parentheticals) - Real Estate Term Note [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Interest rate | 4.30% | 4.10%
Monthly payments | $ 41 | $ 41
London Interbank Offered Rate (LIBOR) [Member] |  |
Variable rate basis | 2.25% | 2.25%

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