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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 10, 2022 USD ($) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Cash and Cash Equivalents, at Carrying Value, Total |  | $ 4,508 | $ 7,821
Percentage of Cash and Cash Equivalents Held by Foreign Subsidiaries |  | 56.00% |
Number of Reporting Units |  | 1 |
Goodwill, Impairment Loss |  | $ 0 |
Impairment of Long-Lived Assets Held-for-use |  | 0 |
Series E Preferred Stock in Biostage [Member] |  |  |
Stock Issued During Period, Value, Issued for Settlement |  | $ 3,900 |
Case in Suffolk Superior Court [Member] | Contingent Convertible Preferred Stock [Member] |  |  |
Stock Issued During Period, Shares, Issued For Settlement (in shares) | shares | 4,000 |  |
Stock Issued During Period, Value, Issued for Settlement | $ 4,000 |  |
Minimum [Member] |  |  |
Customer Payments Term (Day) |  | 0 days |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 4 years |
Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 1 year |
Maximum [Member] |  |  |
Customer Payments Term (Day) |  | 60 days |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 15 years |
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 4 years |

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