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Note 6 - Accrued Retirement Benefits - Changes in Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligations:    
Benefit obligations $ 56,453 $ 56,378
Interest cost 1,974 2,216
Actuarial loss (gain) (3,096) 2,074
Benefits paid (4,025) (4,216)
Benefit obligations 51,306 56,453
Change in plan assets:    
Fair value of plan assets 48,442 47,176
Actual return on plan assets (3,114) 5,531
Employer reimbursement for retirement benefits (118) (230)
Employer contributions 105 181
Benefits paid (4,025) (4,216)
Fair value 41,290 48,442
Funded status (10,016) (8,010)
Accumulated benefit obligations $ 51,306 $ 56,452
Discount rate 4.28%  
Expected long-term return on plan assets 5.00% 5.00%
Rate of compensation increase
Minimum [Member]    
Change in plan assets:    
Discount rate   3.59%
Maximum [Member]    
Change in plan assets:    
Discount rate   3.64%