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Fair Value Measurements (Narrative) (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0   $ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0   0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 0   0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 0   $ 0
Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities $ 258,000 $ 430,000