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Note 10 - Income Tax Benefit (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards, Total | $ 21,800,000 |
Deferred Tax Assets, Valuation Allowance, Total | 5,967,884 | $ 3,371,560
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease), Total | 2,596,324 |
Tax Years Before 2018 [Member] |  |
Operating Loss Carryforwards, Total | $ 12,900,000 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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