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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.