Annual report pursuant to Section 13 and 15(d)

Trading Securities (Schedule Of Change In Investment In Securities) (Details)

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Trading Securities (Schedule Of Change In Investment In Securities) (Details) - Trading Securities [Member] - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value at Beginning of Year $ 1,000 $ 4,000
Purchases
Proceeds from Sale
Loss on Sale
Contributed Capital
Unrealized Loss (3,000)
Fair Value at End of Year $ 1,000 $ 1,000