Note 4 - Investments (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Marketable Securities [Table Text Block]

	September 30, 2025
					Cumulative
					Unrealized
	Fair Value		Basis		Loss
Equity securities	$	30	$	34	$	(4	)
Total	$	30	$	34	$	(4	)

	December 31, 2024
					Cumulative
					Unrealized
	Fair Value		Basis		Loss
Equity securities	$	17	$	34	$	(17	)
Total	$	17	$	34	$	(17	)

Investment Income [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2025		2024		2025		2024
Interest on cash and cash equivalents	$	442	$	531	$	1,287	$	1,568
Net investment income	$	442	$	531	$	1,287	$	1,568

Gain (Loss) on Securities [Table Text Block]

	Three Months Ended September 30,					Nine Months Ended September 30,
	2025		2024			2025		2024
Marketable securities	$	5	$	(2	)	$	13	$	(6	)
Net gains (losses)	$	5	$	(2	)	$	13	$	(6	)