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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Sep. 30, 2019
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of the stock option activity under the 2005, 2009 and 2014 Plans is as follows:
|  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche
|  | 8 |  | 9 |  | 10 |  | 11 |  | 12 |  | 13 |  | 14 |  | 15 |  | 16 |  | 17 |  | 18 |  | 19 |  | 20
|  | January 2, |  | January 2, |  | January 2, |  | January 4, |  | April 19, |  | May 16, |  | August 3, |  | January 3, |  | October 2, |  | December 22, |  | January 2, |  | March 1, |  | January 2,
Grant date |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | 2016 |  | 2016 |  | 2016 |  | 2017 |  | 2017 |  | 2017 |  | 2018 |  | 2018 |  | 2019
Outstanding as of September 30, 2017 |  | 35,500 |  | 34,500 |  | 19,500 |  | 13,500 |  | 60,000 |  | 20,000 |  | 20,000 |  | 18,000 |  | — |  | — |  | — |  | — |  | —
Number of options granted |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 2,500 |  | 8,800 |  | 29,000 |  | 20,000 |  | —
Options exercised |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | —
Options cancelled/expired |  | (355,000) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | —
Outstanding as of September 30, 2018 |  | — |  | 34,500 |  | 19,500 |  | 13,500 |  | 60,000 |  | 20,000 |  | 20,000 |  | 18,000 |  | 2,500 |  | 8,800 |  | 29,000 |  | 20,000 |  | —
Number of options granted |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 36,000
Options exercised |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | —
Options cancelled/expired |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | —
Outstanding as of September 30, 2019 |  | — |  | 34,500 |  | 19,500 |  | 13,500 |  | 60,000 |  | 20,000 |  | 20,000 |  | 18,000 |  | 2,500 |  | 8,800 |  | 29,000 |  | 20,000 |  | 36,000
Options vested and exercisable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At September 30, 2018 |  | — |  | 34,500 |  | 19,500 |  | 13,500 |  | 60,000 |  | 20,000 |  | 20,000 |  | 18,000 |  | 2,500 |  | 8,800 |  | 29,000 |  | 29,000 |  | —
At September 30, 2019 |  | — |  | 34,500 |  | 19,500 |  | 13,500 |  | 60,000 |  | 20,000 |  | 20,000 |  | 18,000 |  | 2,500 |  | 8,800 |  | 29,000 |  | 20,000 |  | 36,000
Weighted average fair value at the grant date (US$) |  | 7.6 |  | 6.5 |  | 7.5 |  | 9.0 |  | 15.4 |  | 12.4 |  | 14.4 |  | 4.0 |  | 7.7 |  | 4.4 |  | 5.1 |  | 5.1 |  | 4.0
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of each option granted is estimated on the date of grant using the Black-Scholes Option Pricing Model:
|  | Tranche |  |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche
|  | 8 |  |  | 9 |  | 10 |  | 11 |  | 12 |  | 13 |  | 14 |  | 15 |  | 16 |  | 17 |  | 18 |  | 19 |  | 20
Exercise price (US$) |  | 14.4 |  |  | 12.7 |  | 14.8 |  | 13.8 |  | 20.5 |  | 16.5 |  | 20.0 |  | 20.7 |  | 16.5 |  | 8.0 |  | 9.1 |  | 8.2 |  | 5.19
Average risk-free interest rate |  | 0.37 | % |  | 0.76 | % | 1.07 | % | 1.73 | % | 1.79 | % | 1.75 | % | 1.55 | % | 1.94 | % | 1.94 | % | 2.26 | % | 2.25 | % | 2.58 |  | 2.49
Expected option life (year) |  | 3 |  |  | 3 |  | 3 |  | 5 |  | 10 |  | 10 |  | 10 |  | 5 |  | 5 |  | 5 |  | 5 |  | 5 |  | 5
Volatility rate |  | 86.32 | % |  | 79.2 | % | 79.67 | % | 80.72 | % | 69.27 | % | 69.92 | % | 65.37 | % | 63.87 | % | 52.40 | % | 63.2 | % | 64.6 | % | 68.2 |  | 103.0
Dividend yield |  | — |  |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | —

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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