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Note 4 - Investments (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Investment Holdings, Schedule of Investments [Table Text Block]

		September 30, 2025								December 31, 2024
		Cost				Fair Value				Cost				Fair Value
		(In thousands)
Investments
Debt		$	585,292			$	560,190			$	678,167			$	638,779
Warrants			15,370				16,444				15,956				18,277
Other			46,409				3,181				36,709				14,637
Equity			39,122				23,699				35,942				26,198
Total investments		$	686,193			$	603,514			$	766,774			$	697,891

		September 30, 2025								December 31, 2024
		Cost				Fair Value				Cost				Fair Value
		(In thousands)
Life Science
Biotechnology		$	101,585			$	66,100			$	118,221			$	97,562
Medical Device			219,162				212,678				213,564				205,634
Technology
Communications			522				3,321				11,711				14,763
Consumer-Related			59,389				25,675				74,421				36,667
Data Storage			417				163				417				350
Internet and Media			329				151				329				999
Networking			364				119				10,070				9,827
Semiconductors			—				—				45				—
Software			151,884				142,835				154,040				151,043
Sustainability
Alternative Energy			4,859				4,845				—				—
Energy Efficiency			125				25				9,818				9,712
Other Sustainability			44,562				44,659				66,151				66,079
Healthcare Information and Services
Diagnostics			17,581				19,309				16,704				13,701
Other			39,557				35,359				39,533				40,144
Software			45,857				48,275				51,750				51,410
Total investments		$	686,193			$	603,514			$	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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