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Note 4 - Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
Table Text Block [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] | We sponsor three defined benefit pension plans, two of which cover substantially all U.S. employees. Net periodic pension (benefit) cost for the plans consisted of the following for the three and nine months ended September 30, 2023 and 2022 (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 949 |  |  | $ | 1,566 |  |  | $ | 2,847 |  |  | $ | 4,697 |
Interest cost |  |  | 1,993 |  |  |  | 1,369 |  |  |  | 5,979 |  |  |  | 4,107 |
Expected return on plan assets |  |  | (3,107 | ) |  |  | (3,363 | ) |  |  | (9,321 | ) |  |  | (10,089 | )
Amortization of prior service cost |  |  | 125 |  |  |  | 128 |  |  |  | 375 |  |  |  | 384 |
Amortization of net loss |  |  | (47 | ) |  |  | 512 |  |  |  | (141 | ) |  |  | 1,537 |
Net periodic pension (benefit) cost |  | $ | (87 | ) |  | $ | 212 |  |  | $ | (261 | ) |  | $ | 636 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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