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Note 4 - Investments (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

Investment Holdings, Schedule of Investments [Table Text Block]

		March 31, 2025								December 31, 2024
		Cost				Fair Value				Cost				Fair Value
		(In thousands)
Investments
Debt		$	699,761			$	643,567			$	678,167			$	638,779
Warrants			16,120				18,603				15,956				18,277
Other			36,723				13,697				36,709				14,637
Equity			37,988				13,686				35,942				26,198
Total investments		$	790,592			$	689,553			$	766,774			$	697,891

		March 31, 2025								December 31, 2024
		Cost				Fair Value				Cost				Fair Value
		(In thousands)
Life Science
Biotechnology		$	138,360			$	116,174			$	118,221			$	97,562
Medical Device			220,360				192,105				213,564				205,634
Technology
Communications			518				3,547				11,711				14,763
Consumer-Related			74,805				27,362				74,421				36,667
Data Storage			417				322				417				350
Internet and Media			329				911				329				999
Networking			10,076				9,826				10,070				9,827
Semiconductors			45				—				45				—
Software			161,916				159,213				154,040				151,043
Sustainability
Energy Efficiency			9,824				9,713				9,818				9,712
Other Sustainability			65,329				64,109				66,151				66,079
Healthcare Information and Services
Diagnostics			17,252				14,661				16,704				13,701
Other			39,552				40,166				39,533				40,144
Software			51,809				51,444				51,750				51,410
Total investments		$	790,592			$	689,553			$	766,774			$	697,891

X

- Definition

Tabular disclosure of data and information required in the supplementary schedule applicable to management investment companies listing holdings of unaffiliated investments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-1

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X

- References

No definition available.

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