Goodwill And Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill Attributable to Each Business Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 10,598	[1]	$ 34,689
Impairment charge				(24,091)
FQT acquisition		18,534
Goodwill, Ending Balance	[1]	29,132		10,598
Ethanol Production [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance			[1]	24,091
Impairment charge				(24,091)
FQT acquisition		18,534
Goodwill, Ending Balance	[1]	18,534
Partnership [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		10,598	[1]	10,598
Impairment charge
Goodwill, Ending Balance	[1]	$ 10,598		$ 10,598

[1] The company records goodwill within other assets on the consolidated balance sheets.