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Note G - Pension and Other Postretirement Benefits - Amounts Recognized in the Company's Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in plan assets:      
Plan assets at beginning of year $ 68,275    
Plan assets at end of year 83,318 $ 68,275  
Noncurrent liabilities (9,309)  
Pension Plan [Member]      
Accumulated benefit obligation at end of year 64,033 63,830  
Benefit obligation at beginning of year 77,600 80,069  
Service cost 2,837 3,064 $ 2,904
Interest cost 2,643 2,640 2,895
Settlement 1,431  
Benefits paid (5,510) (10,069)  
Effect of foreign exchange  
Actuarial (gain) loss (463) 465  
Benefit obligation at end of year 77,107 77,600 80,069
Change in plan assets:      
Plan assets at beginning of year 68,291 75,573  
Actual return on plan assets 4,537 (1,213)  
Employer contributions 16,000 4,000  
Benefits paid (5,510) (10,069)  
Plan assets at end of year 83,318 68,291 75,573
Funded status at end of year 6,211 (9,309)  
Noncurrent assets 6,211    
Current liabilities  
Noncurrent liabilities (9,309)  
Total assets (liabilities) 6,211 (9,309)  
Net actuarial loss (gain) 27,041 29,992  
Deferred tax (benefit) expense (10,506) (11,590)  
After tax actuarial loss (gain) 16,535 18,402  
Postretirement Plan [Member]      
Accumulated benefit obligation at end of year 22,340 22,430  
Benefit obligation at beginning of year 22,430 22,813  
Service cost 1,192 1,194 907
Interest cost 842 790 845
Settlement  
Benefits paid (1,637) (1,094)  
Effect of foreign exchange 7 (94)  
Actuarial (gain) loss (494) (1,179)  
Benefit obligation at end of year 22,340 22,430 22,813
Change in plan assets:      
Plan assets at beginning of year  
Actual return on plan assets  
Employer contributions 1,637 1,094  
Benefits paid (1,637) (1,094)  
Plan assets at end of year
Funded status at end of year (22,340) (22,430)  
Noncurrent assets  
Current liabilities (1,631) (1,646)  
Noncurrent liabilities (20,709) (20,784)  
Total assets (liabilities) (22,340) (22,430)  
Net actuarial loss (gain) (7,890) (8,082)  
Deferred tax (benefit) expense 2,978 3,038  
After tax actuarial loss (gain) $ (4,912) $ (5,044)