Note 4 - Investments (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Marketable Securities [Table Text Block]

	March 31, 2024
					Cumulative
					Unrealized
	Fair Value		Basis		(Loss) Gain
Equity securities	$	19	$	34	$	(15	)
Total	$	19	$	34	$	(15	)

	December 31, 2023
					Cumulative
					Unrealized
	Fair Value		Basis		(Loss) Gain
Equity securities	$	22	$	34	$	(12	)
Total	$	22	$	34	$	(12	)

Investment Income [Table Text Block]

	Three Months Ended March 31,
	2024		2023
Interest on cash and cash equivalents	$	499	$	198
Net investment income	$	499	$	198

Gain (Loss) on Securities [Table Text Block]

	Three Months Ended March 31,
	2024			2023
Marketable securities	$	(3	)	$	345
Net (losses) gains	$	(3	)	$	345