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15. FAIR VALUE MEASUREMENTS (Details) - USD ($) | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Derivative instruments | $ 6,488,310 | $ 9,317,064
Level 1 |  |
Derivative instruments | 0 | 33
Level 2 |  |
Derivative instruments | 0 | 0
Level 3 |  |
Derivative instruments | $ 6,488,310 | $ 9,317,031

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