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Note 16 - Subsequent Events (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 13, 2019 | Jun. 27, 2018 | Jun. 29, 2017 | Mar. 25, 2019 | Mar. 24, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Proceeds from Warrant Exercises |  |  |  |  |  |  | $ 749,233
Stock Issued During Period, Shares, New Issues |  |  | 125,000 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  | $ 11,300,000 | $ 11,300,000 |  |
Class of Warrant or Right, Retired |  |  |  |  | 2,800,000 |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 2,800,000 |  |
Liability Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  | $ 2.38 |  |  |  |  |
Liability Options [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 2,300,000 |  |  |  |  |
Liability Options [Member] | Chief Executive Officer [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 0 |  |  |  |  |  |
Liability Options [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 700,000 |  |  |  |  |
Liability Options [Member] | Chief Financial Officer [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 0 |  |  |  |  |  |
The 2019 Options [Member[ |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 3,575 |
The 2019 Options [Member[ | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 1.36 |  |  |  |  |  |
The 2019 Options [Member[ | Chief Executive Officer [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 2,300,000 |  |  |  |  |  |
The 2019 Options [Member[ | Chief Financial Officer [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 800,000 |  |  |  |  |  |

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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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