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Note 9 - Pensions and Other Postretirement Benefits - Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Plan Fair Value Assets $ 80,285 $ 72,395
Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 29,752 28,059
Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets 50,533 44,333
Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets 3
Equity Securities [Member]    
Plan Fair Value Assets 12,986 10,147
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 12,986 10,144
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets 3
Fixed Income Securities [Member]    
Plan Fair Value Assets 57,816 54,101
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 11,671 9,768
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets 46,145 44,333
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets
Mutual Funds [Member]    
Plan Fair Value Assets 1,992 1,777
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 1,992 1,777
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets
Cash and Cash Equivalents [Member]    
Plan Fair Value Assets 7,491 6,370
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 3,103 6,370
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets 4,388
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets