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Note 9 - Pensions and Other Postretirement Benefits - Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Plan Fair Value Assets $ 77,067 $ 80,285
Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 26,398 29,752
Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets 50,649 50,533
Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets 20 0
Equity Securities [Member]    
Plan Fair Value Assets 12,639 12,986
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 12,619 12,986
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets 0 0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets 20 0
Fixed Income Securities [Member]    
Plan Fair Value Assets 55,045 57,816
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 9,582 11,671
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets 45,463 46,145
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets 0 0
Mutual Funds [Member]    
Plan Fair Value Assets 2,108 1,992
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 2,108 1,992
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets 0 0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets 0 0
Cash and Cash Equivalents [Member]    
Plan Fair Value Assets 7,275 7,491
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]    
Plan Fair Value Assets 2,089 3,103
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]    
Plan Fair Value Assets 5,186 4,388
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]    
Plan Fair Value Assets $ 0 $ 0