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Note 12 - Subsequent Events (Details Textual) - USD ($) |  | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 11, 2021 | Jan. 31, 2021 | Jul. 31, 2020 | Feb. 28, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | $ 1,823,658 | $ 1,175,896
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  | 36,902 |
Proceeds from Warrant Exercises |  |  |  |  | $ 2,500 |
Series I Warrants [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  | 29,755 |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  | $ 3,174,156 |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,644,000 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 6.25 |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 9,400,000 |  |  |  |  |
Subsequent Event [Member] | Over-Allotment Option [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 204,000 |  |  |  |  |
Subsequent Event [Member] | Series I Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  | 62,626 |  |
Subsequent Event [Member] | Pre-Funded Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  | 126,042 |  |
Subsequent Event [Member] | Unit Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  | 690,034 |  |
Subsequent Event [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  | 835,900 |  |
SBIR Grant [Member] | Subsequent Event [Member] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | $ 299,927 |  |  |  |

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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