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Note 8 - Retirement Plans - Pension Plan Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined benefit plan, fair value of plan assets $ 88,248 $ 80,929 $ 69,246
Fair Value, Inputs, Level 1 [Member]      
Defined benefit plan, fair value of plan assets 71,375 62,572  
Fair Value, Inputs, Level 2 [Member]      
Defined benefit plan, fair value of plan assets 16,873 18,357  
Fair Value, Inputs, Level 3 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Insurance General Account [Member]      
Defined benefit plan, fair value of plan assets 16,873 18,357  
Insurance General Account [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Insurance General Account [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined benefit plan, fair value of plan assets 16,873 18,357  
Insurance General Account [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Cash and Cash Equivalents [Member]      
Defined benefit plan, fair value of plan assets 3,229 5,089  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined benefit plan, fair value of plan assets 3,229 5,089  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Equity Securities [Member]      
Defined benefit plan, fair value of plan assets 37,536 31,963  
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined benefit plan, fair value of plan assets 37,536 31,963  
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Fixed Income Securities [Member]      
Defined benefit plan, fair value of plan assets 27,146 22,544  
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined benefit plan, fair value of plan assets 27,146 22,544  
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Real Estate [Member]      
Defined benefit plan, fair value of plan assets 3,464 2,976  
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined benefit plan, fair value of plan assets 3,464 2,976  
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined benefit plan, fair value of plan assets 0 0  
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined benefit plan, fair value of plan assets $ 0 $ 0