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Note 6 - Accrued Retirement Benefits - Fair Values of Pension Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair value of pension plan assets $ 48,442 $ 47,176 $ 56,434
Fair Value, Inputs, Level 1 [Member]      
Fair value of pension plan assets  
Fair Value, Inputs, Level 2 [Member]      
Fair value of pension plan assets 48,442 47,176  
Equity Funds [Member]      
Fair value of pension plan assets 14,772 7,177  
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of pension plan assets  
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of pension plan assets 14,772 7,177  
Fixed Income Funds [Member]      
Fair value of pension plan assets 32,581 39,025  
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of pension plan assets  
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of pension plan assets 32,581 39,025  
Money Market Funds [Member]      
Fair value of pension plan assets 1,089 974  
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of pension plan assets  
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of pension plan assets $ 1,089 $ 974