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Note 8 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Preferred Stock [Table Text Block] |
|  | December 31, 2020 |  |  | December 31, 2019 |
|  |  |  |  |  | Carrying |  |  |  |  |  |  | Carrying |
|  | Shares |  |  | Value |  |  | Shares |  |  | Value |
Series B Convertible Preferred Stock |  |  | 100 |  |  | $ | 76,095 |  |  |  | 100 |  |  | $ | 76,095 |
Series H Convertible Preferred Stock |  |  | - |  |  |  | - |  |  |  | 1,686 |  |  |  | 1,156,338 |
Series I Convertible Preferred Stock |  |  | - |  |  |  | - |  |  |  | 700 |  |  |  | 700,000 |
Total |  |  | 100 |  |  | $ | 76,095 |  |  |  | 2,486 |  |  | $ | 1,932,433 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2020 |  |  | 2019 |
Weighted average risk-free interest rates |  |  | 0.69 | % |  |  | N/A |
Expected dividend yield |  |  | 0.0 | % |  |  | N/A |
Expected life of option (years) |  | 7.0 |  |  |  | N/A |
Expected volatility |  |  | 38.16 | % |  |  | N/A |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (yrs) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2019 |  |  | - |  |  | $ | - |  |  |  |  |  |  |  |  |
Granted |  |  | 602,000 |  |  |  | 2.79 |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2020 |  |  | 602,000 |  |  | $ | 2.79 |  |  |  | 9.9 |  |  | $ | 355,180 |
Exercisable at December 31, 2020 |  |  | -0- |  |  | $ | - |  |  |  | - |  |  | $ | - |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
Warrant Description |  | Number of Shares |  |  | Exercise Price |  | Expiration
Series I Warrants |  |  | 62,626 |  |  | $ | 5.00 |  | Oct-Dec 2024
June 2020 Warrants |  |  | 120,000 |  |  |  | 5.00 |  | Jun 2025
Pre-Funded Warrants |  |  | 126,042 |  |  |  | 0.01 |  | Perpetual
Unit, Conversion and Management Warrants |  |  | 3,163,669 |  |  |  | 5.00 |  | Sep 2025
Representative Warrants |  |  | 128,000 |  |  |  | 5.50 |  | Mar 2024
Total Warrants Outstanding at December 31, 2020 |  |  | 3,600,337 |  |  |  |  |  |
Weighted-Average Exercise Price |  | $ | 4.84 |  |  |  |  |  |
Weighted-Average Remaining Life (excluding Pre-Funded Warrants) (years) |  | 4.7 |  |  |  |  |  |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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