Summary of Significant Accounting Policies (Notes) gal in Millions	9 Months Ended
	Jun. 30, 2017 USD ($) gal	Sep. 30, 2016 USD ($)
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Nature of Business and Significant Accounting Policies Principal business activity: Lincolnway Energy, LLC (the "Company"), located in Nevada, Iowa, was formed in May 2004 to build and operate a 50 million gallon annual production dry mill corn-based ethanol plant. The Company began making sales on May 30, 2006 and became operational during the quarter ended June 30, 2006. The Company is directly influenced by commodity markets and the agricultural and energy industries and, accordingly, its results of operations and financial condition may be significantly affected by cyclical market trends and the regulatory, political and economic conditions in these industries. Basis of presentation and other information: The balance sheet as of September 30, 2016 was derived from the Company's audited balance sheet as of that date. The accompanying financial statements as of June 30, 2017 and for the three and nine months ended June 30, 2017 and 2016 are unaudited and reflect all adjustments (consisting only of normal recurring adjustments) which are, in the opinion of management, necessary for a fair presentation of the financial position and operating results for the interim periods. These unaudited financial statements and notes should be read in conjunction with the audited financial statements and notes thereto, for the year ended September 30, 2016 contained in the Company's Annual Report on Form 10-K. The results of operations for the interim periods presented are not necessarily indicative of the results for the entire year. Use of estimates: The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Cash and cash equivalents: The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Although the Company maintains its cash accounts in one bank, the Company believes it is not exposed to any significant credit risk on cash and cash equivalents. At September 30, 2016, the Company closed all repurchase agreements. Prior to September 30, 2016 the Company utilized the repurchase account to invest excess cash in a bank overnight repurchase account. Trade accounts receivable: Trade accounts receivable are recorded at original invoice amounts less an estimate made for doubtful receivables based on a review of all outstanding amounts on a monthly basis. Management determines the allowance for doubtful accounts by regularly evaluating individual customer receivables and considering customers financial condition, credit history and current economic conditions. Receivables are written off when deemed uncollectible. Recoveries of receivables written off are recorded when received. A receivable is considered past due if any portion of the receivable is outstanding more than 90 days. There was no allowance for doubtful account balance as of June 30, 2017 and September 30, 2016. Inventories: Inventories are stated at the lower of weighted average cost or net realizable value using the first-in, first-out method. In the valuation of inventories and purchase commitments, net realizable value is defined as estimated selling price in the ordinary course of business less reasonable predictable costs of completion, disposal and transportation. Derivative financial instruments: The Company periodically enters into derivative contracts to hedge the Company’s exposure to price risk related to forecasted corn needs, forward corn purchase contracts and ethanol sales. The Company does not typically enter into derivative instruments other than for hedging purposes. All the derivative contracts are recognized on the balance sheet at their fair market value. Although the Company believes its derivative positions are economic hedges, none have been designated as a hedge for accounting purposes. Accordingly, any realized or unrealized gain or loss related to corn and natural gas derivatives is recorded in the statement of operations as a component of cost of goods sold. Any realized or unrealized gain or loss related to ethanol derivative instruments is recorded in the statement of operations as a component of revenue. The Company reports all contracts with the same counter party on a net basis on the balance sheet. Unrealized gains and losses on forward contracts, in which delivery has not occurred, are deemed “normal purchases and normal sales”, and therefore are not marked to market in the Company’s financial statements, but are subject to a lower of cost or market assessment. Revenue recognition: Revenue from the sale of the Company’s ethanol and distillers grains is recognized at the time title and all risks of ownership transfer to the customers. This generally occurs upon the loading of the product. For ethanol, title passes at the time the product crosses the loading flange in either a railcar or truck. For distillers grain, title passes upon the loading into trucks or railcars. Shipping and handling costs incurred by the Company for the sale of distillers grain are included in costs of goods sold. Ethanol revenue is reported free on board (FOB) and all shipping and handling costs are incurred by the ethanol marketer. Commissions for the marketing and sale of ethanol and distiller grains are included in costs of goods sold. Deferred revenue: Deferred revenue represents fees received under a service agreement in advance of services being performed. The related revenue is deferred and recognized as the services are performed over the 10 year agreement. Income taxes: The Company is organized as a partnership for federal and state income tax purposes and generally does not incur income taxes. Instead, the Company’s earnings and losses are included in the income tax returns of the members. Therefore, no provision or liability for federal or state income taxes has been included in these financial statements. Earnings per unit: Basic and diluted net income (loss) per unit have been computed on the basis of the weighted average number of units outstanding during each period presented.
Principal Business Activity [Policy Text Block]	Principal business activity: Lincolnway Energy, LLC (the "Company"), located in Nevada, Iowa, was formed in May 2004 to build and operate a 50 million gallon annual production dry mill corn-based ethanol plant. The Company began making sales on May 30, 2006 and became operational during the quarter ended June 30, 2006. The Company is directly influenced by commodity markets and the agricultural and energy industries and, accordingly, its results of operations and financial condition may be significantly affected by cyclical market trends and the regulatory, political and economic conditions in these industries.
Basis of Accounting, Policy [Policy Text Block]	Basis of presentation and other information: The balance sheet as of September 30, 2016 was derived from the Company's audited balance sheet as of that date. The accompanying financial statements as of June 30, 2017 and for the three and nine months ended June 30, 2017 and 2016 are unaudited and reflect all adjustments (consisting only of normal recurring adjustments) which are, in the opinion of management, necessary for a fair presentation of the financial position and operating results for the interim periods. These unaudited financial statements and notes should be read in conjunction with the audited financial statements and notes thereto, for the year ended September 30, 2016 contained in the Company's Annual Report on Form 10-K. The results of operations for the interim periods presented are not necessarily indicative of the results for the entire year.
Use of Estimates, Policy [Policy Text Block]	Use of estimates: The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and cash equivalents: The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Although the Company maintains its cash accounts in one bank, the Company believes it is not exposed to any significant credit risk on cash and cash equivalents. At September 30, 2016, the Company closed all repurchase agreements. Prior to September 30, 2016 the Company utilized the repurchase account to invest excess cash in a bank overnight repurchase account.
Trade and Other Accounts Receivable, Policy [Policy Text Block]	Trade accounts receivable: Trade accounts receivable are recorded at original invoice amounts less an estimate made for doubtful receivables based on a review of all outstanding amounts on a monthly basis. Management determines the allowance for doubtful accounts by regularly evaluating individual customer receivables and considering customers financial condition, credit history and current economic conditions. Receivables are written off when deemed uncollectible. Recoveries of receivables written off are recorded when received. A receivable is considered past due if any portion of the receivable is outstanding more than 90 days. There was no allowance for doubtful account balance as of June 30, 2017 and September 30, 2016.
Inventory, Policy [Policy Text Block]	Inventories: Inventories are stated at the lower of weighted average cost or net realizable value using the first-in, first-out method. In the valuation of inventories and purchase commitments, net realizable value is defined as estimated selling price in the ordinary course of business less reasonable predictable costs of completion, disposal and transportation.
Financial Instruments Disclosure [Text Block]	Derivative financial instruments: The Company periodically enters into derivative contracts to hedge the Company’s exposure to price risk related to forecasted corn needs, forward corn purchase contracts and ethanol sales. The Company does not typically enter into derivative instruments other than for hedging purposes. All the derivative contracts are recognized on the balance sheet at their fair market value. Although the Company believes its derivative positions are economic hedges, none have been designated as a hedge for accounting purposes. Accordingly, any realized or unrealized gain or loss related to corn and natural gas derivatives is recorded in the statement of operations as a component of cost of goods sold. Any realized or unrealized gain or loss related to ethanol derivative instruments is recorded in the statement of operations as a component of revenue. The Company reports all contracts with the same counter party on a net basis on the balance sheet. Unrealized gains and losses on forward contracts, in which delivery has not occurred, are deemed “normal purchases and normal sales”, and therefore are not marked to market in the Company’s financial statements, but are subject to a lower of cost or market assessment.
Revenue Recognition, Policy [Policy Text Block]	Revenue recognition: Revenue from the sale of the Company’s ethanol and distillers grains is recognized at the time title and all risks of ownership transfer to the customers. This generally occurs upon the loading of the product. For ethanol, title passes at the time the product crosses the loading flange in either a railcar or truck. For distillers grain, title passes upon the loading into trucks or railcars. Shipping and handling costs incurred by the Company for the sale of distillers grain are included in costs of goods sold. Ethanol revenue is reported free on board (FOB) and all shipping and handling costs are incurred by the ethanol marketer. Commissions for the marketing and sale of ethanol and distiller grains are included in costs of goods sold.
Deferred Revenue [Policy Text Block]	Deferred revenue: Deferred revenue represents fees received under a service agreement in advance of services being performed. The related revenue is deferred and recognized as the services are performed over the 10 year agreement.
Income Tax, Policy [Policy Text Block]	Income taxes: The Company is organized as a partnership for federal and state income tax purposes and generally does not incur income taxes. Instead, the Company’s earnings and losses are included in the income tax returns of the members. Therefore, no provision or liability for federal or state income taxes has been included in these financial statements.
Earnings Per Share, Policy [Policy Text Block]	Earnings per unit: Basic and diluted net income (loss) per unit have been computed on the basis of the weighted average number of units outstanding during each period presented.
Allowance for Doubtful Accounts Receivable \| $	$ 0	$ 0
Annual ethanol production \| gal	50
Number of days outstanding for a past due trade receivables	90 days