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ORGANIZATION AND BASIS OF PRESENTATION. (Details Narrative) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) shares | Dec. 31, 2018 USD ($) Number shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 15, 2016 | Dec. 31, 2015 USD ($)
Number of ethanol plants | Number |  |  |  |  | 9 |  |  |  |  |
Ethanol production capacity per year |  |  | 605 million gallons per year |  | 605 million gallons of annual production capacity, of which plant assets representing 355 million gallons of capacity are either unencumbered, or their entire sales proceeds would be used to repay the senior secured notes. The Company has engaged an independent third party to help facilitate the marketing of certain of these assets; and in excess of $20 million of equity available under the Company’s shelf registration statement, including under its at-the-market equity program. |  |  |  |  |
Ethanol market capacity per year |  |  | Markets nearly 1.0 billion gallons of ethanol |  | Markets nearly 1.0 billion gallons of ethanol |  |  |  |  |
Other products produced per year |  |  | Produces over 3.0 million tons of co-products |  | Produces over 3.0 million tons of co-products |  |  |  |  |
Accounts receivable used as collateral | $ 61,743 |  | $ 61,743 |  | $ 54,820 |  | $ 64,501 |  |  |
Allowance for doubtful accounts | 39 |  | 39 |  | 12 |  | 19 |  |  |
Bad debt expense | 0 | $ 1 | 27 | $ 44 | 45 |  | 5 | $ 306 |  |
Benefit for income taxes |  |  |  | $ 563 | (562) |  | (321) | (981) |  |
Accounts receivable | 69,297 |  | 69,297 |  | $ 67,636 | [1] | 80,344 |  |  |
Employees covered by collective bargaining agreement |  |  |  |  | 35.00% |  |  |  |  |
Net inventory valuation adjustment | $ 0 |  | $ 0 |  | $ 2,328 |  | 2,678 |  |  |
Amortization of deferred financing costs |  |  |  |  | 900 |  | 503 | $ 137 |  |
Unamortized deferred financing costs |  |  |  |  | $ 1,377 |  | $ 1,925 |  |  |
Potentially dilutive shares from convertible securities outstanding | shares | 635,000 | 425,000 | 635,000 | 635,000 | 635,000 |  | 719,000 | 704,000 |  |
Cash | $ 18,921 | $ 56,093 | $ 18,921 | $ 56,093 | $ 26,627 | [1] | $ 49,489 | $ 64,259 |  | $ 51,550
Bad debts recovery | 0 | $ 1 |  |  |  |  |  |  |  |
Ethanol production plant assest |  |  | 355 million gallons |  |  |  |  |  |  |
Customer A and B [Member] |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | $ 13,405 |  | $ 17,792 |  |  |
Concentration risk percentage |  |  |  |  | 20.00% |  | 24.00% |  |  |
ACEC [Member] |  |  |  |  |  |  |  |  |  |
Noncontrolling interest owned |  |  |  |  | 26.07% |  | 26.07% |  |  |
Pacific Aurora [Member] |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 73.93% |  | 73.93% |  | 100.00% |
Pacific Aurora [Member] | ACEC [Member] |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 26.07% |  | 26.07% |  |  |
Kinergy Marketing LLC [Member] |  |  |  |  |  |  |  |  |  |
Cash | 18,900 |  | $ 18,900 |  |  |  |  |  |  |
Line of credit | $ 2,200 |  | $ 2,200 |  | $ 10,200 |  |  |  |  |
[1] | Amounts derived from the audited consolidated financial statements for the year ended December 31, 2018.

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