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Note 4 - Investments (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Investment Holdings, Schedule of Investments [Table Text Block]

		December 31, 2023								December 31, 2022
		Cost				Fair Value				Cost				Fair Value
		(In thousands)
Investments
Debt		$	721,231			$	670,172			$	701,074			$	686,458
Warrants			16,526				24,594				14,790				29,712
Other			6,982				6,430				1,200				1,300
Equity			14,443				7,889				4,184				2,556
Total investments		$	759,182			$	709,085			$	721,248			$	720,026

		December 31, 2023								December 31, 2022
		Cost				Fair Value				Cost				Fair Value
		(In thousands)
Life Science
Biotechnology		$	145,544			$	117,781			$	193,372			$	195,006
Medical Device			147,064				145,019				132,803				135,960
Technology
Communications			19,192				22,188				22,892				26,176
Consumer-Related			105,669				101,327				121,961				114,050
Data Storage			417				418				476				1,316
Internet and Media			329				1,582				329				1,159
Networking			5,451				5,297				11,831				11,710
Power Management			1,585				2,700				1,585				2,610
Semiconductors			45				—				56				—
Software			164,133				160,749				120,157				118,716
Sustainability
Energy Efficiency			111				13				8				27
Other Sustainability			98,906				80,370				84,633				85,524
Healthcare Information and Services
Diagnostics			19,735				19,701				9,851				9,858
Other			102				1,366				7,559				3,870
Software			50,899				50,574				13,735				14,044
Total investments		$	759,182			$	709,085			$	721,248			$	720,026

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)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480524/946-210-50-6

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480524/946-210-50-6

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//1943274/2147480524/946-210-50-6

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//1943274/2147480524/946-210-50-6

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//1943274/2147480524/946-210-50-6

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//1943274/2147480524/946-210-50-1

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- References

No definition available.

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