Condensed Consolidated Statements of Changes in Members' Equity - USD ($)	Class A units	Class B units	Members' Equity attributable to Heron Lake BioEnergy LLC	Noncontrolling Interest	Total
Balance at Oct. 31, 2018			$ 53,054,846	$ 1,723,839	$ 54,778,685
Balance (in units) at Oct. 31, 2018	62,932,107	15,000,000
Increase (Decrease) in Stockholders' Equity
Net income attributable to non-controlling interest				91,406	91,406
Net loss attributable to Heron Lake BioEnergy, LLC			(2,023,640)		(2,023,640)
Balance at Jan. 31, 2019			51,031,206	1,815,245	52,846,451
Balance (in units) at Jan. 31, 2019	62,932,107	15,000,000
Balance at Oct. 31, 2018			53,054,846	1,723,839	54,778,685
Balance (in units) at Oct. 31, 2018	62,932,107	15,000,000
Increase (Decrease) in Stockholders' Equity
Net loss attributable to Heron Lake BioEnergy, LLC					(2,812,213)
Balance at Jul. 31, 2019			50,242,633	1,920,864	52,163,497
Balance (in units) at Jul. 31, 2019	62,932,107	15,000,000
Balance at Jan. 31, 2019			51,031,206	1,815,245	52,846,451
Balance (in units) at Jan. 31, 2019	62,932,107	15,000,000
Increase (Decrease) in Stockholders' Equity
Net income attributable to non-controlling interest				70,613	70,613
Net loss attributable to Heron Lake BioEnergy, LLC			(1,115,152)		(1,115,152)
Balance at Apr. 30, 2019			49,916,054	1,885,858	51,801,912
Balance (in units) at Apr. 30, 2019	62,932,107	15,000,000
Increase (Decrease) in Stockholders' Equity
Net income attributable to non-controlling interest				35,006	35,006
Net loss attributable to Heron Lake BioEnergy, LLC			326,579		326,579
Balance at Jul. 31, 2019			50,242,633	1,920,864	52,163,497
Balance (in units) at Jul. 31, 2019	62,932,107	15,000,000
Balance at Oct. 31, 2019			47,599,276	2,001,575	$ 49,600,851
Balance (in units) at Oct. 31, 2019	62,932,107	15,000,000			77,932,107
Increase (Decrease) in Stockholders' Equity
Acquisition of non-controlling interest			(155,598)	(2,069,402)	$ (2,225,000)
Net income attributable to non-controlling interest				67,827	67,827
Net loss attributable to Heron Lake BioEnergy, LLC			(2,416,374)		(2,416,374)
Balance at Jan. 31, 2020			45,027,304		45,027,304
Balance (in units) at Jan. 31, 2020	62,932,107	15,000,000
Balance at Oct. 31, 2019			47,599,276	$ 2,001,575	$ 49,600,851
Balance (in units) at Oct. 31, 2019	62,932,107	15,000,000			77,932,107
Increase (Decrease) in Stockholders' Equity
Net loss attributable to Heron Lake BioEnergy, LLC					$ (12,619,196)
Balance at Jul. 31, 2020			34,824,482		$ 34,824,482
Balance (in units) at Jul. 31, 2020	62,932,107	15,000,000			77,932,107
Balance at Jan. 31, 2020			45,027,304		$ 45,027,304
Balance (in units) at Jan. 31, 2020	62,932,107	15,000,000
Increase (Decrease) in Stockholders' Equity
Net loss attributable to Heron Lake BioEnergy, LLC			(6,242,249)		(6,242,249)
Balance at Apr. 30, 2020			38,785,055		38,785,055
Balance (in units) at Apr. 30, 2020	62,932,107	15,000,000
Increase (Decrease) in Stockholders' Equity
Net loss attributable to Heron Lake BioEnergy, LLC			(3,960,573)		(3,960,573)
Balance at Jul. 31, 2020			$ 34,824,482		$ 34,824,482
Balance (in units) at Jul. 31, 2020	62,932,107	15,000,000			77,932,107