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Note 8 - Employee Retirement Plans - Net Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Benefit obligation at beginning of the period $ 88,960 $ 91,654 $ 90,247
Service cost 0 112 427
Interest cost 2,168 2,907 3,751
Benefits paid (5,693) (5,990) (5,967)
Actuarial (gain) loss (A) [1] (1,127) 5,277 8,198
Settlement 0 (4,407) (4,978)
Foreign currency exchange rate changes 0 (593) (24)
Benefit obligation at end of the period 84,308 88,960 91,654
Fair value of plan assets at beginning of the period 56,495 59,625 56,790
Actual return 4,374 6,890 7,498
Actuarial loss 0 18 983
Administrative expenses 0 (49) (68)
Defined Benefit Plan, Plan Assets, Contributions by Employer 1,603 1,615 5,027
Benefits paid (5,693) (5,990) (5,967)
Settlement 0 (5,000) (4,638)
Foreign currency exchange rate changes 0 (614) 0
Fair value of plan assets at end of the period 56,779 56,495 59,625
Unfunded status at end of the period (27,529) (32,465) (32,029)
Current liabilities (1,578) (1,524) (1,422)
Noncurrent liabilities (25,951) (30,941) (30,607)
Net amount recognized $ (27,529) $ (32,465) $ (32,029)
[1] The change in the actuarial (gain) loss for the three years ended December 31, 2021 was primarily attributable to changes in the discount rate.