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Note 4 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Nonoperating Income (Expense) [Member] |  |
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component | $ (1.4) | $ 0.2

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- Definition Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Balance Type: |
Period Type: |