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Note 14 - Employee Benefit Plans - Summary of Fair Values of Pension Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair value of plan assets $ 30,051 $ 32,353 $ 31,738
Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets 14,910 15,658  
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]      
Fair value of plan assets 2,371 2,744  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member]      
Fair value of plan assets 2,008 2,272  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Mid Cap [Member]      
Fair value of plan assets 863 867  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Small Cap [Member]      
Fair value of plan assets 169 224  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member]      
Fair value of plan assets 1,733 2,256  
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]      
Fair value of plan assets 405 391  
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member]      
Fair value of plan assets 547 600  
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]      
Fair value of plan assets 6,814 6,304  
Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets 15,141 16,695  
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 $ 15,141 $ 16,695