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Note 8 - Stockholders' Equity - Preferred Stock Summary (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Preferred stock, shares outstanding (in shares) |  | 100 | 2,486
Preferred Stock | $ 0 | $ 76,095 | $ 1,932,433
Series B Convertible Preferred Stock [Member] |  |  |
Preferred stock, shares outstanding (in shares) | 0 | 100 | 100
Preferred Stock |  | $ 76,095 | $ 76,095
Series H Convertible Preferred Stock [Member] |  |  |
Preferred stock, shares outstanding (in shares) |  | 0 | 1,686
Preferred Stock |  | $ 0 | $ 1,156,338
Series I Convertible Preferred Stock [Member] |  |  |
Preferred stock, shares outstanding (in shares) |  | 0 | 700
Preferred Stock |  | $ 0 | $ 700,000

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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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