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Note 1 - Basis of Presentation (Details Textual) - shares | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Number of Shares Issuable Upon the Exercise of Options and Warrants (in shares) | 0 | 0 | 479,802
Weighted Average Number Diluted Shares Outstanding Adjustment, Total (in shares) |  | 0 |
Conversion of Series A Preferred Stock to Common Stock [Member] |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares) | 5,000,000 |  |
Conversion of Series B Preferred Stock to Common Stock [Member] |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares) | 1,700,000 |  |
Conversion of Series C Preferred Stock to Common Stock [Member] |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares) | 1,700,000 |  |

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e2029-109256 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1930-109256 + Details
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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