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Note 15 - Employee Benefit Plans - Summary of Fair Values of Pension Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair value of plan assets $ 31,738 $ 30,199 $ 34,398
Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets 12,750 12,732  
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]      
Fair value of plan assets 2,228 1,415  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member]      
Fair value of plan assets 1,935 1,590  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Mid Cap [Member]      
Fair value of plan assets 1,067 967  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Small Cap [Member]      
Fair value of plan assets 609 489  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member]      
Fair value of plan assets 2,214 1,886  
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]      
Fair value of plan assets 546 458  
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member]      
Fair value of plan assets 757 690  
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]      
Fair value of plan assets 3,394 5,237  
Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets 18,988 17,467  
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Mid Cap [Member]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Small Cap [Member]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member]      
Fair value of plan assets $ 18,988 $ 17,467