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Note 13 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Allocated Share-based Compensation Expense, Total | $ 145,789 | $ 177,402 | $ 284,250 | $ 642,151
Cost of Sales [Member] |  |  |  |
Allocated Share-based Compensation Expense, Total | 5,047 | 5,874 | 11,256 | 11,751
Selling, General and Administrative Expenses [Member] |  |  |  |
Allocated Share-based Compensation Expense, Total | 120,133 | 148,600 | 229,455 | 584,097
Research and Development Expense [Member] |  |  |  |
Allocated Share-based Compensation Expense, Total | $ 20,609 | $ 22,928 | $ 43,539 | $ 46,303

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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 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 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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