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Note 13 - Retirement Benefit Plans - Changes in Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair value of plan assets at end of year $ 0    
Pension Plan [Member]      
Fair value of plan assets at beginning of year 15,000    
Fair value of plan assets at end of year   $ 15,000  
Postretirement Health Coverage [Member]      
Benefit obligation at beginning of year 7,800 8,600  
Service cost 100 0 $ 100
Interest cost 200 300 300
Actuarial loss (gain) (300) (100)  
Foreign exchange 0 0  
Benefits paid (500) (1,000)  
Benefit obligation at end of year 7,300 7,800 8,600
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 500 1,000  
Foreign exchange 0 0  
Benefits paid (500) (1,000)  
Fair value of plan assets at end of year 0 0 0
Funded status at end of year (7,300) (7,800)  
Noncurrent Other Assets 0 0  
Current Liabilities (700) (700)  
Long-Term Liabilities (6,600) (7,100)  
Net accrued liability (7,300) (7,800)  
Prior service cost 0 0  
Net actuarial (loss) gain 800 400  
Accumulated Other Comprehensive (Loss) Income 800 400  
UNITED STATES | Pension Plan [Member]      
Service cost 0 0 0
Interest cost 0 100 0
UNITED STATES | Nonqualified Plan [Member]      
Benefit obligation at beginning of year 1,300 1,300  
Service cost 0 0  
Interest cost 0 100  
Actuarial loss (gain) 0 0  
Foreign exchange 0 0  
Benefits paid (100) (100)  
Benefit obligation at end of year 1,200 1,300 1,300
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 100 100  
Foreign exchange 0 0  
Benefits paid (100) (100)  
Fair value of plan assets at end of year 0 0 0
Funded status at end of year (1,200) (1,300)  
Noncurrent Other Assets 0 0  
Current Liabilities (100) (200)  
Long-Term Liabilities (1,100) (1,100)  
Net accrued liability (1,200) (1,300)  
Prior service cost 0 0  
Net actuarial (loss) gain (900) (900)  
Accumulated Other Comprehensive (Loss) Income (900) (900)  
Foreign Plan [Member] | Pension Plan [Member]      
Benefit obligation at beginning of year 15,700 15,000  
Service cost 0 0 100
Interest cost 200 300 300
Actuarial loss (gain) 1,700 1,000  
Foreign exchange 800 200  
Benefits paid (800) (800)  
Benefit obligation at end of year 17,600 15,700 15,000
Fair value of plan assets at beginning of year 12,200 10,800  
Actual return on plan assets 600 800  
Employer contributions 900 1,000  
Foreign exchange 400 400  
Benefits paid (800) (800)  
Fair value of plan assets at end of year 13,300 12,200 $ 10,800
Funded status at end of year (4,300) (3,500)  
Noncurrent Other Assets 1,100 1,800  
Current Liabilities 0 0  
Long-Term Liabilities (5,400) (5,300)  
Net accrued liability (4,300) (3,500)  
Prior service cost (200) (100)  
Net actuarial (loss) gain (2,000) (400)  
Accumulated Other Comprehensive (Loss) Income $ (2,200) $ (500)