REVENUE - Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
REVENUE - Revenue (Details) - USD ($)	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Revenue Recognition
Total Revenues	$ 49,980,729	$ 14,165,041	$ 111,454,900	$ 56,450,290
Payment terms			10 days
Ethanol production
Revenue Recognition
Total Revenues	49,861,642	14,039,050	$ 110,604,946	55,398,270
Natural gas pipeline
Revenue Recognition
Total Revenues	119,087	125,991	849,954	1,052,020
Ethanol
Revenue Recognition
Total Revenues	39,647,617	11,920,049	87,688,837	43,306,209
Ethanol \| Ethanol production
Revenue Recognition
Total Revenues	39,647,617	11,920,049	87,688,837	43,306,209
Distillers' Grains
Revenue Recognition
Total Revenues	7,221,342	1,645,859	16,147,687	9,481,770
Distillers' Grains \| Ethanol production
Revenue Recognition
Total Revenues	7,221,342	1,645,859	16,147,687	9,481,770
Corn Oil
Revenue Recognition
Total Revenues	2,581,949	401,623	5,828,429	2,051,049
Corn Oil \| Ethanol production
Revenue Recognition
Total Revenues	2,581,949	401,623	5,828,429	2,051,049
Other
Revenue Recognition
Total Revenues	410,734	71,519	939,993	559,242
Other \| Ethanol production
Revenue Recognition
Total Revenues	410,734	71,519	939,993	559,242
Natural Gas
Revenue Recognition
Total Revenues	119,087	125,991	$ 849,954	1,052,020
Payment terms			20 days
Natural Gas \| Natural gas pipeline
Revenue Recognition
Total Revenues	$ 119,087	$ 125,991	$ 849,954	$ 1,052,020

Heron Lake BioEnergy, LLC 10-Q