QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)	3 Months Ended	12 Months Ended
Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
QUARTERLY FINANCIAL DATA (UNAUDITED)
Revenues	$ 28,267,341	$ 27,367,787	$ 25,494,797	$ 25,697,520	$ 24,365,831	$ 26,252,916	$ 29,880,856	$ 27,972,451	$ 27,994,905	$ 28,541,889	$ 25,990,784	$ 27,390,074	$ 106,827,445	$ 108,472,054	$ 109,917,652
Gross profit (loss)	(1,779,583)	1,248,103	(419,654)	(1,033,800)	(709,108)	1,092,414	2,127,807	1,581,182	2,913,491	2,251,294	1,850,266	3,414,231	(1,984,934)	4,092,295	10,429,282
Operating income (loss)	(2,535,502)	381,693	(1,275,409)	(1,953,327)	(1,481,450)	373,043	1,285,823	716,139	2,137,579	1,518,888	1,080,594	2,567,534	(5,382,545)	893,555	7,304,595
Net income (loss) attributable to Heron Lake BioEnergy, LLC	$ (2,643,357)	$ 326,579	$ (1,115,152)	$ (2,023,640)	$ (1,580,485)	$ 302,686	$ 1,271,018	$ 861,997	$ 2,002,070	$ 1,414,752	$ 1,019,120	$ 2,832,416	$ (5,455,570)	$ 855,216	$ 7,268,355
Basic and diluted earnings (loss) per unit (Class A and B)	$ (0.03)		$ (0.01)	$ (0.03)	$ (0.02)		$ 0.02	$ 0.01	$ 0.02	$ 0.02	$ 0.01	$ 0.04	$ (0.07)	$ 0.01	$ 0.09

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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