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Note 12 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($) $ in Millions	Jul. 31, 2023	Jul. 27, 2023	Jul. 25, 2023	Jul. 18, 2023	Jul. 13, 2023	Jul. 12, 2023	Jul. 06, 2023
Conversion From Loan to Common Shares [Member]
Debt Conversion, Original Debt, Amount					$ 2.7
Conversion From Loan to Preferred Stock [Member]
Debt Conversion, Original Debt, Amount					0.5
Venture Loan and Security Agreement [Member] | Conversion From Loan to Common Shares [Member]
Debt Conversion, Original Debt, Amount						$ 5.0
Debt Conversion, Converted Instrument, Shares Issued (in shares)						2,164,502
Venture Loan and Security Agreement [Member] | Evelo Biosciences, Inc. [Member]
Repayments of Debt						$ 5.0
Debt Investments [Member] | Nexii Building Solutions, Inc1 [Member]
Payments to Acquire Investments		$ 0.2	$ 0.3				$ 0.3
Debt Investments [Member] | Aerobiotix, LLC [Member]
Payments to Acquire Investments				$ 0.2
Debt Investments [Member] | Tallac Therapeutics, Inc [Member]
Payments to Acquire Investments	$ 5.0
Equity Investment [Member] | Better Place Forests Co. [Member]
Payments to Acquire Investments					$ 0.8

X

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or 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 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-3

Reference 2: 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

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- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "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
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-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
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X

- Definition

Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
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