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Note 8 - Financial Instruments With Off-balance-sheet Risk - Unfunded Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Unfunded commitments, principal balance	$ 168,236	$ 180,500
Fair value of unfunded commitment liability	1,787	2,033
BrightInsight, Inc. [Member]
Unfunded commitments, principal balance	15,500	15,500
Fair value of unfunded commitment liability	205	241
Britecore Holdings, Inc. [Member]
Unfunded commitments, principal balance	2,500	5,000
Fair value of unfunded commitment liability	36	72
Candesant Biomedical Corporation [Member]
Unfunded commitments, principal balance	10,000	10,000
Fair value of unfunded commitment liability	151	151
Ceribell, Inc. [Member]
Unfunded commitments, principal balance	21,000	0
Fair value of unfunded commitment liability	120	0
Divergent Technologies, Inc. [Member]
Unfunded commitments, principal balance	0	11,250
Fair value of unfunded commitment liability	0	118
Elligo Healthcare Research, Inc. [Member]
Unfunded commitments, principal balance	15,000	15,000
Fair value of unfunded commitment liability	194	194
MicroTransponder, Inc. [Member]
Unfunded commitments, principal balance	22,500	22,500
Fair value of unfunded commitment liability	0	0
Mirantis, Inc [Member]
Unfunded commitments, principal balance	15,000	15,000
Fair value of unfunded commitment liability	136	136
Nexii Building Solutions, Inc [Member]
Unfunded commitments, principal balance	486	0
Fair value of unfunded commitment liability	0	0
Optoro, Inc. [Member]
Unfunded commitments, principal balance	6,250	6,250
Fair value of unfunded commitment liability	0	0
Parse Biosciences, Inc. [Member]
Unfunded commitments, principal balance	15,000	15,000
Fair value of unfunded commitment liability	251	251
SafelyYou, Inc [Member]
Unfunded commitments, principal balance	20,000	20,000
Fair value of unfunded commitment liability	270	270
Sonex Health, Inc. [Member]
Unfunded commitments, principal balance	0	15,000
Fair value of unfunded commitment liability	0	176
Supply Network Visibility Holdings, LLC [Member]
Unfunded commitments, principal balance	10,000	10,000
Fair value of unfunded commitment liability	35	35
Tallac Therapeutics, Inc [Member]
Unfunded commitments, principal balance	5,000	10,000
Fair value of unfunded commitment liability	229	229
Viken Detection Corporation [Member]
Unfunded commitments, principal balance	10,000	10,000
Fair value of unfunded commitment liability	$ 160	$ 160

X

- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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- Definition

The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

No definition available.

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