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Note 4 - Investments (Details Textual) - Contingent Convertible Preferred Stock [Member] - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
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Series A-1 and A-2, Preferred Stock [Member] |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 4,100,000 | $ 3,400,000
Series E Preferred Stock [Member] |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 995,000 | $ 995,000

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
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