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Note 5 - Financing Arrangements - Summary of Interest Rate Swap Agreements (Details) - Interest Rate Swap [Member] - Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Notional amount $ 161,875 $ 170,600
Average fixed rate 4.10% 4.10%