Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net revenues	$ 104,454,116	$ 85,001,379	$ 296,445,621	$ 277,299,775
Cost of revenues:
Production	7,286,860	8,889,751	22,117,229	22,583,763
Brokerage fees	168,043	146,960	486,099	476,047
Total cost of revenues	102,048,821	82,284,471	285,643,013	262,246,506
Gross profit (loss)	2,405,295	2,716,908	10,802,608	15,053,269
Operating expenses:
Administration	857,116	848,890	2,780,612	2,781,405
Operating income (loss)	1,548,179	1,868,018	8,021,996	12,271,864
Other income (expense):
Interest expense	(238,984)	(196,440)	(897,325)	(656,729)
Other non-operating income (expense)	83,534	(17,253)	(217,798)	402,213
Patronage dividend income	0	0	195,553	169,456
Total other income (expense)	(155,450)	(213,693)	(919,570)	(85,060)
Income (loss) before income taxes	1,392,729	1,654,325	7,102,426	12,186,804
Income tax benefit (expense)	0	0	0	(600)
Net income (loss)	$ 1,392,729	$ 1,654,325	$ 7,102,426	$ 12,186,204
Basic and Diluted Loss Per Capital Unit [Abstract]
Net income (in dollars per share)	$ 0.05	$ 0.05	$ 0.23	$ 0.40
Weighted average number of capital units outstanding for calculation of basic and diluted earnings per capital unit (in shares)	30,419,000	30,419,000	30,419,000	30,419,000
Product
Cost of revenues:
Cost of products and services	$ 85,001,018	$ 65,035,124	$ 234,803,800	$ 212,714,179
Freight and rail
Cost of revenues:
Cost of products and services	$ 9,592,900	$ 8,212,636	$ 28,235,885	$ 26,472,517