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Fair Value Measures and Disclosures (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents—Money market mutual funds $ 567 $ 2,799
Equity Securities, FV-NI 1,127 823
Marketable Securities 1,762 10,308
Trading securities held in a "rabbi trust" 139 116
Total assets 3,595 14,046
Deferred compensation accrual "rabbi trust" 148 116
Total liabilities 148 116
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents—Money market mutual funds 567 2,799
Equity Securities, FV-NI 1,127 823
Marketable Securities 1,762 10,308
Trading securities held in a "rabbi trust" 139 116
Total assets 3,595 14,046
Deferred compensation accrual "rabbi trust" 148 116
Total liabilities 148 116
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents—Money market mutual funds 0 0
Equity Securities, FV-NI 0 0
Marketable Securities 0 0
Trading securities held in a "rabbi trust" 0 0
Total assets 0 0
Deferred compensation accrual "rabbi trust" 0 0
Total liabilities 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents—Money market mutual funds 0 0
Equity Securities, FV-NI 0 0
Marketable Securities 0 0
Trading securities held in a "rabbi trust" 0 0
Total assets 0 0
Deferred compensation accrual "rabbi trust" 0 0
Total liabilities $ 0 $ 0