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Note 16 - Employee Benefit Plans - Summary of Fair Values of Pension Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair value of plan assets $ 30,199 $ 34,398 $ 33,838
Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets 12,732 17,639  
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]      
Fair value of plan assets 1,415 1,090  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member]      
Fair value of plan assets 1,590 5,845  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Mid Cap [Member]      
Fair value of plan assets 967 1,343  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Small Cap [Member]      
Fair value of plan assets 489 795  
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member]      
Fair value of plan assets 1,886 1,484  
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]      
Fair value of plan assets 458 473  
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member]      
Fair value of plan assets 690 147  
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]      
Fair value of plan assets 5,237 6,462  
Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets 17,467 16,759  
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 $ 17,467 $ 16,759