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Note 8 - Financial Instruments With Off-balance-sheet Risk - Unfunded Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Unfunded commitments, principal balance	$ 149,000	$ 181,000
Fair value of unfunded commitment liability	1,170	1,637
Britecore Holdings, Inc. [Member]
Unfunded commitments, principal balance	0	2,500
Fair value of unfunded commitment liability	0	36
Candesant Biomedical, Inc. [Member]
Unfunded commitments, principal balance	0	10,000
Fair value of unfunded commitment liability	0	151
Ceribell, Inc. [Member]
Unfunded commitments, principal balance	21,000	21,000
Fair value of unfunded commitment liability	120	120
Crafty Holdings, Inc.[Member]
Unfunded commitments, principal balance	5,000	5,000
Fair value of unfunded commitment liability	65	65
Fictiv, Inc. [Member]
Unfunded commitments, principal balance	0	30,000
Fair value of unfunded commitment liability	0	236
GT Medical Technologies, Inc. [Member]
Unfunded commitments, principal balance	20,000	20,000
Fair value of unfunded commitment liability	100	100
HappyCo, Inc [Member]
Unfunded commitments, principal balance	2,000	0
Fair value of unfunded commitment liability	25	0
Hometeam Technologies, Inc [Member]
Unfunded commitments, principal balance	10,000	10,000
Fair value of unfunded commitment liability	100	100
Long Grove Pharmaceuticals, LLC [Member]
Unfunded commitments, principal balance	10,000	0
Fair value of unfunded commitment liability	75	0
MasteryPrep, LLC [Member]
Unfunded commitments, principal balance	5,000	0
Fair value of unfunded commitment liability	50	0
MicroTransponder, Inc. [Member]
Unfunded commitments, principal balance	7,500	15,000
Fair value of unfunded commitment liability	0	0
MML US, Inc [Member]
Unfunded commitments, principal balance	20,000	0
Fair value of unfunded commitment liability	100	0
OneNetworks, Inc. dba Finexio [Member]
Unfunded commitments, principal balance	0	5,000
Fair value of unfunded commitment liability	0	26
Onkos Surgical, Inc. [Member]
Unfunded commitments, principal balance	5,000	5,000
Fair value of unfunded commitment liability	27	27
Parse Biosciences, Inc. [Member]
Unfunded commitments, principal balance	5,000	15,000
Fair value of unfunded commitment liability	84	252
Pivot Bio, Inc. [Member]
Unfunded commitments, principal balance	10,000	20,000
Fair value of unfunded commitment liability	105	209
SafelyYou, Inc [Member]
Unfunded commitments, principal balance	0	5,000
Fair value of unfunded commitment liability	0	73
Scientia Vascular, Inc. [Member]
Unfunded commitments, principal balance	3,500	0
Fair value of unfunded commitment liability	42	0
Sparkcharge, Inc. [Member]
Unfunded commitments, principal balance	10,000	0
Fair value of unfunded commitment liability	123	0
Standvast Holdings, LLC [Member]
Unfunded commitments, principal balance	0	2,500
Fair value of unfunded commitment liability	0	88
Supply Network Visibility Holdings, LLC [Member]
Unfunded commitments, principal balance	10,000	10,000
Fair value of unfunded commitment liability	79	79
Ursa Space Systems Inc. [Member]
Unfunded commitments, principal balance	5,000	5,000
Fair value of unfunded commitment liability	$ 75	$ 75

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 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 2: 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

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478898/942-825-50-1

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