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Note 16 - Subsequent Event - Conversion of Biostage Series E Preferred Stock to Common Stock (Details Textual) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 07, 2023 | Apr. 05, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Biostage [Member] | Series E Convertible Preferred Stock into Common Stock [Member] |  |  |  |
Conversion of Stock, Amount Issued |  |  | $ 200,000 |
Conversion of Stock, Shares Issued (in shares) |  |  | 31,933 |
Biostage [Member] | Convertible Preferred Stock [Member] |  |  |  |
Preferred Stock, Mandatory Conversion, Minimum Qualified Offering Amount |  |  |  | $ 4,000,000
Subsequent Event [Member] | Biostage [Member] |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner | 5.00% |  |  |
Subsequent Event [Member] | Biostage [Member] | Series E Convertible Preferred Stock into Common Stock [Member] |  |  |  |
Conversion of Stock, Shares Issued (in shares) | 675,000 |  |  |
Subsequent Event [Member] | Biostage [Member] | Convertible Preferred Stock [Member] |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ 6.00 |  |  |
Subsequent Event [Member] | Private Placement [Member] | Biostage [Member] |  |  |  |
Conversion of Stock, Amount Issued |  | $ 6,000,000.0 |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 6.00 |  |
Subsequent Event [Member] | Private Placement [Member] | Biostage [Member] | Convertible Preferred Stock [Member] |  |  |  |
Preferred Stock, Mandatory Conversion, Minimum Qualified Offering Amount |  | $ 4,000,000.0 |  |

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- Definition The value of the financial instrument issued [noncash or part noncash] in the conversion of stock. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-5 + Details
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