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Note 12 - Subsequent Events	9 Months Ended
	Sep. 30, 2023
Notes to Financial Statements
Subsequent Events [Text Block]	Note 12. Subsequent Events On  October 27, 2023, Evelo Biosciences, Inc. (“Evelo”) paid down $11.0 million of the principal amount of its loans outstanding under that certain Venture Loan and Security Agreement by and among the Company, the other lender parties therein and Evelo, dated as of  December 15, 2022, as amended.  As of October 30, 2023, the fair value of the Company’s equity investment in Evelo is $1.1 million, compared to the fair value of $8.5 million shown on the Schedule of Investments as of September 30, 2023 above.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

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