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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
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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 |  |

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- 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 + Details
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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 -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 + Details
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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 -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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- 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 -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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