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) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Contributed Capital $ 160,000
Trading Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value at Beginning of Year 324,000 6,026,000
Purchases 510,000
Proceeds from Sale (783,000) (3,061,000)
Loss on Sale (95,000) (1,460,000)
Contributed Capital 160,000
Unrealized Loss (57,000) (1,181,000)
Fair Value at December 31, 2016 $ 59,000 $ 324,000