PROGOLD LIMITED LIABILITY COMPANY (Details) - Progold Limited Liability Company - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ProGold Limited Liability Company
Ownership percentage in joint venture	49.00%
Financial information for ProGold LLC
Current Assets	$ 230	$ 245	$ 514
Long-Term Assets	38,962	38,643	39,843
Total Assets	39,192	38,888	40,357
Current Liabilities	5	5	5
Long-Term Liabilities	2,333	1,167
Total Liabilities	2,338	1,172	5
Members' Equity	36,854	37,716	40,352
Total Liabilities and Members' Equity	39,192	38,888	40,357
Rent Revenue on Operating Lease	19,085	17,571	22,873
Expenses	3,455	3,440	2,905
Net Income	$ 15,630	$ 14,131	$ 19,968