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Note 7 - Redeemable, Convertible Preferred Stock - Schedule of Redeemable, Convertible Preferred Stock (Parenthetical) (Details) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 11, 2026 | Feb. 26, 2021 | Feb. 25, 2021 | Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
6.0% Series B Preferred Stock [Member] |  |  |  |  |  |
Redeemable Convertible Preferred Stocks [Line Items] |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.00% |  |  | 6.00% | 6.00% | 6.00%
4.0% Series B Preferred Stock [Member] |  |  |  |  |  |
Redeemable Convertible Preferred Stocks [Line Items] |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 4.00% | 4.00% | 4.00% | 4.00% | 4.00% | 4.00%

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- Definition Redeemable Convertible Preferred Stocks. + References No definition available. + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
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