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Note 4 - Other Expense, Net (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Other Nonoperating Income (Expense), Total $ (800,000) $ (645,000)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ (562,000) $ (614,000)