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Note 5 - Transactions With Affiliated Companies (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Investments in and Advances to Affiliates [Table Text Block]

										Three months ended June 30, 2023

		*Fair value at*												*Transfers*								*Net*								*Fair value at*
Portfolio		*March 31,*												*in/(out) at*				*Dividends*				*unrealized*				*Net realized*				*June 30,*
Company		*2023*				*Purchases*				*Sales*				*fair value*				*declared*				*gain/(loss)*				*gain/(loss)*				*2023*
		(In thousands)
Cadrenal Therapeutics, Inc.			846				—				—				—				—				60				—				906
Total non-controlled affiliates		$	846			$	—			$	—			$	—			$	—			$	60			$	—			$	906

										Six months ended June 30, 2023
		*Fair value at*												*Transfers*								*Net*								*Fair value at*
Portfolio		*December 31,*								*Principal*				*in/(out) at*				*Discount*				*unrealized*				*Net realized*				*June 30,*
Company		*2022*				*Purchases*				*Payments*				*fair value*				*accretion*				*gain/(loss)*				*gain/(loss)*				*2023*
		(In thousands)
Cadrenal Therapeutics, Inc.		$	—			$	—			$	—			$	—			$	—			$	906			$	—			$	906
Total non-controlled affiliates		$	—			$	—			$	—			$	—			$	—			$	906			$	—			$	906

										Three months ended June 30, 2022

		*Fair value at*												*Transfers*								*Net*								*Fair value at*
Portfolio		*March 31,*												*in/(out) at*				*Dividends*				*unrealized*				*Net realized*				*June 30,*
Company		*2022*				*Purchases*				*Sales*				*fair value*				*declared*				*gain/(loss)*				*gain/(loss)*				*2022*
		(In thousands)
HESP LLC			—				—				(200	)			—				—				1,400				(1,200	)			—
Total controlled affiliates		$	—			$	—			$	(200	)		$	—			$	—			$	1,400			$	(1,200	)		$	—

										*Six months ended June 30, 2022*
		*Fair value at*												*Transfers*								*Net*								*Fair value at*
Portfolio		*December 31,*								*Principal*				*in/(out) at*				*Discount*				*unrealized*				*Net realized*				*June 30,*
Company		*2021*				*Purchases*				*Payments*				*fair value*				*accretion*				*gain/(loss)*				*gain/(loss)*				*2022*
		(In thousands)
HESP LLC			—				—				(250	)			—				—				1,450				(1,200	)			—
Total controlled affiliates		$	—			$	—			$	(250	)		$	—			$	—			$	1,450			$	(1,200	)		$	—