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Note 9 - Employee Retirement Plans - Net Funded Status (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Benefit obligation at beginning of the period |  | $ 91,654 | $ 90,247 | $ 103,443
Increase in benefit obligation due to business combination |  | 0 | 0 | 5,474
Service cost |  | 112 | 427 | 294
Interest cost |  | 2,907 | 3,751 | 3,605
Benefits paid |  | (5,990) | (5,967) | (5,467)
Actuarial (gain) loss (A) | [1] | 5,277 | 8,198 | (8,105)
Settlement |  | (4,407) | (4,978) | (8,885)
Foreign currency exchange rate changes |  | (593) | (24) | (112)
Benefit obligation at end of the period |  | 88,960 | 91,654 | 90,247
Fair value of plan assets at beginning of the period |  | 59,625 | 56,790 | 57,536
Increase in plan assets due to business combination |  | 0 | 0 | 5,463
Actual return |  | 6,890 | 7,498 | (2,128)
Expected return |  | 0 | 0 | 112
Actuarial loss |  | 18 | 983 | (275)
Administrative expenses |  | (49) | (68) | (36)
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | 1,615 | 5,027 | 10,546
Benefits paid |  | (5,990) | (5,967) | (5,467)
Settlement |  | (5,000) | (4,638) | (8,885)
Foreign currency exchange rate changes |  | (614) | 0 | (76)
Fair value of plan assets at end of the period |  | 56,495 | 59,625 | 56,790
Payroll tax unrecognized in benefit obligation at end of the period |  | 0 | 0 | 84
Unfunded status at end of the period |  | (32,465) | (32,029) | (33,541)
Current liabilities |  | (1,524) | (1,422) | (1,380)
Noncurrent liabilities |  | (30,941) | (30,607) | (32,161)
Net amount recognized |  | $ (32,465) | (32,029) | (33,541)
Other Pension Plan [Member] |  |  |  |
Benefit obligation at beginning of the period |  |  | 0 | 2,924
Service cost |  |  |  | 61
Interest cost |  |  |  | 117
Benefits paid |  |  |  | (595)
Actuarial (gain) loss (A) |  |  |  | 229
Benefit obligation at end of the period |  |  |  | 0
Fair value of plan assets at beginning of the period |  |  | $ 0 | 0
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  |  | 377
Benefits paid |  |  |  | (595)
Fair value of plan assets at end of the period |  |  |  | 0
Unfunded status at end of the period |  |  |  | 0
Participant contributions |  |  |  | 218
Plan amendment |  |  |  | (2,954)
Participant contributions |  |  |  | $ 218
[1] | The change in the actuarial (gain) loss for the three years ended December 31, 2020 was primarily attributable to changes in the discount rate.

X
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) debit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References No definition available. + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases plan assets of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References No definition available. + Details
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