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Note 13 - Share-based Compensation (Tables) | 6 Months Ended
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Mar. 31, 2018
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number |  |  | Weighted Average |
|  | of Shares |  |  | Exercise Price |
Outstanding October 1, 2017 |  |  | 4,663,502 |  |  | $ | 2.16 |
Granted |  |  | 3,500 |  |  | $ | 2.21 |
Forfeited/expired |  |  | (83,333 | ) |  | $ | 2.84 |
Exercised |  |  | (110,852 | ) |  | $ | 1.68 |
Outstanding March 31, 2018 |  |  | 4,472,817 |  |  | $ | 2.15 |
Exercisable March 31, 2018 |  |  | 3,298,533 |  |  | $ | 2.23 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three months ended |  |  | Six months ended |
|  | March 31, |  |  | March 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Cost of revenues |  | $ | 5,047 |  |  | $ | 5,874 |  |  | $ | 11,256 |  |  | $ | 11,751 |
Selling, general and administrative |  |  | 120,133 |  |  |  | 148,600 |  |  |  | 229,455 |  |  |  | 584,097 |
Research and development |  |  | 20,609 |  |  |  | 22,928 |  |  |  | 43,539 |  |  |  | 46,303 |
Total |  | $ | 145,789 |  |  | $ | 177,402 |  |  | $ | 284,250 |  |  | $ | 642,151 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Six months ended |
|  | March 31, |
|  | 2018 |  |  | 2017 |
Volatility |  | 45.4% |  |  | 47.5% | - | 53.7% |
Risk-free interest rate |  | 2.2% |  |  | 1.7% | - | 2.0% |
Forfeiture rate |  | 10.0% |  |  |  | 10.0% |  |
Dividend yield |  | 0.0% |  |  |  | 0.0% |  |
Expected life in years |  | 4.6 |  |  | 3.8 | - | 4.6 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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