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Note 2 - Going Concern and Liquidity (Details Textual) - USD ($) |  |  | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 17, 2020 | Apr. 14, 2020 | Apr. 30, 2020 | Feb. 28, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  |  |  |  | $ 765,975 | $ 1,516,272 | $ 2,739,700 | $ 1,996,271
Underwrite Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 141,850 |  |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 5,715,000 |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  |  | $ 2,000,000 |  |  |  |
Subsequent Event [Member] | Underwrite Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 356,250 | 2,375,000 | 2,375,000 |  |  |  |  |
Subsequent Event [Member] | Public Offering [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 712,500 | 4,750,000 | 4,750,000 |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total | $ 4,700,000 | $ 4,500,000 | $ 4,700,000 |  |  |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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