Note 6 - Stock Option Plans (Details Textual) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Allocated Share-based Compensation Expense | $ 299,175 | $ 81,678 | $ 543,290 | $ 107,205 |
| Employee Stock Option [Member] | ||||
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | 1,421,364 | 580,331 | $ 1,421,364 | $ 580,331 |
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 182 days | 2 years 178 days | ||
| Non-employee Options [Member] | ||||
| Allocated Share-based Compensation Expense | $ 6,067 | $ 2,807 | $ 12,324 | $ 8,421 |
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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