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Note 9 - Non-pension Post-retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]
Year ended December 31,
  
U.S. Plans
    
Non-U.S. Plans
    
Total
  
(dollars in thousands)
  
2019
    
2018
    
2019
    
2018
    
2019
    
2018
  
Change in accumulated non-pension post-retirement benefit obligation:
                                                
Benefit obligation, beginning of year
   $
45,899
     $
52,648
     $
1,067
     $
1,295
     $
46,966
     $
53,943
  
Service cost
    
443
      
604
      
1
      
1
      
444
      
605
  
Interest cost
    
1,836
      
1,822
      
36
      
38
      
1,872
      
1,860
  
Plan participants’ contributions
    
409
      
512
      
—
      
—
      
409
      
512
  
Actuarial (gain) loss
    
4,666
      
(5,305
 )    
(41
 )    
(106
 )    
4,625
      
(5,411
 )
Exchange rate fluctuations
    
—
      
—
      
49
      
(96
 )    
49
      
(96
 )
Benefits paid
    
(4,990
 )    
(4,382
 )    
(51
 )    
(65
 )    
(5,041
 )    
(4,447
 )
Benefit obligation, end of year
   $
48,263
     $
45,899
     $
1,061
     $
1,067
     $
49,324
     $
46,966
  
                                                 
Funded status and accrued benefit cost
   $
48,263
     $
45,899
     $
1,061
     $
1,067
     $
49,324
     $
46,966
  
Non-Pension Post-retirement Benefit Plans [Member]  
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
Year ended December 31,
  
U.S. Plans
    
Non-U.S. Plans
    
Total
  
(dollars in thousands)
  
2019
    
2018
    
2019
    
2018
    
2019
    
2018
  
Service cost
   $
443
     $
604
     $
1
     $
1
     $
444
     $
605
  
Interest cost on projected benefit obligation
    
1,836
      
1,822
      
36
      
38
      
1,872
      
1,860
  
Amortization of unrecognized:
                                                
Prior service credit
    
(282
 )    
(282
 )    
—
      
—
      
(282
 )    
(282
 )
Actuarial gain
    
(376
 )    
(209
 )    
(76
 )    
(64
 )    
(452
 )    
(273
 )
Non-pension post-retirement benefit expense (income)
   $
1,621
     $
1,935
     $
(39
 )   $
(25
 )   $
1,582
     $
1,910
  
 
The non-service cost components of benefit expense above are included in other income (expense) on the Consolidated Statements of Operations. See note 16 for additional information.
Defined Benefit Plan, Assumptions [Table Text Block]
   
U.S. Plans
    
Non-U.S. Plans
  
   
2019
    
2018
    
2019
    
2018
  
Net periodic benefit expense
    
 
    
 
    
 
    
 
Discount rate
  
4.27
 %  
3.60
 %  
3.52
 %  
3.26
 %
Non-pension post-retirement benefit obligation
    
 
    
 
    
 
    
 
Discount rate
  
3.41
 %  
4.27
 %  
2.92
 %  
3.52
 %
Weighted average assumed healthcare cost trend rates
    
 
    
 
    
 
    
 
Healthcare cost trend rate assumed for next year
  
6.00
 %  
6.25
 %  
6.00
 %  
6.25
 %
Ultimate healthcare trend rate
  
4.50
 %  
5.00
 %  
5.00
 %  
5.00
 %
Year the ultimate healthcare trend rate is reached
  
2026
    
2024
    
2024
    
2024
  
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
December 31,
      
 
      
 
(dollars in thousands)
  
2019
    
2018
  
Non-pension post-retirement benefits (current portion)
   $
3,817
     $
3,951
  
Non-pension post-retirement benefits
    
45,507
      
43,015
  
Total non-pension post-retirement benefits liability
   $
49,324
     $
46,966
  
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
December 31,
  
U.S. Plans
    
Non-U.S. Plans
    
Total
  
(dollars in thousands)
  
2019
    
2018
    
2019
    
2018
    
2019
    
2018
  
Net actuarial gain
   $
(134
 )   $
(5,176
 )   $
(808
 )   $
(806
 )   $
(942
 )   $
(5,982
 )
Prior service credit
    
(698
 )    
(980
 )    
—
      
—
      
(698
 )    
(980
 )
Total credit in AOCI
   $
(832
 )   $
(6,156
 )   $
(808
 )   $
(806
 )   $
(1,640
 )   $
(6,962
 )
Schedule of Expected Benefit Payments [Table Text Block]
Fiscal Year
                          
(dollars in thousands)
    
U.S. Plans
    
Non-U.S. Plans
    
Total
  
2020
     $
3,768
     $
114
     $
3,882
  
2021
     $
3,686
     $
109
     $
3,795
  
2022
     $
3,688
     $
103
     $
3,791
  
2023
     $
3,594
     $
93
     $
3,687
  
2024
     $
3,498
     $
84
     $
3,582
  
2025-2029     $
15,370
     $
245
     $
15,615