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Note 8 - Employee Benefit Plans - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair value, plan assets $ 32,415 $ 25,007
Fair Value, Inputs, Level 1 [Member]    
Fair value, plan assets 26,040 19,125
Fair Value, Inputs, Level 2 [Member]    
Fair value, plan assets 6,375 5,882
Cash [Member]    
Fair value, plan assets 4,336 4,350
Cash [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value, plan assets 4,336 4,350
Defined Benefit Plan, Equity Securities, US [Member]    
Fair value, plan assets 15,129 11,098
Defined Benefit Plan, Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value, plan assets 15,129 11,098
Defined Benefit Plan, Equity Securities, Non-US [Member]    
Fair value, plan assets 2,735 2,334
Defined Benefit Plan, Equity Securities, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value, plan assets 2,735 2,334
Equity Funds [Member]    
Fair value, plan assets [1] 3,840 1,343
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value, plan assets [1] 3,840 1,343
US States and Political Subdivisions Debt Securities [Member]    
Fair value, plan assets 152 202
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value, plan assets 152 202
Corporate Debt Securities [Member]    
Fair value, plan assets [2] 6,223 5,680
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value, plan assets [2] $ 6,223 $ 5,680
[1] This category comprises actively managed equity funds invested in large-cap and mid-cap U.S. companies.
[2] This category represents investment grade bonds of U.S. issuers from diverse industries.