Note 5 - Investments (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Marketable Securities [Table Text Block]

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

	December 31, 2022
					Cumulative
					Unrealized
	Fair Value		Basis		(Loss) Gain
Equity securities (a)	$	69	$	4,307	$	(4,238	)
Mutual funds (b)		16,516		16,990		(474	)
Total	$	16,585	$	21,297	$	(4,712	)

Investment Income [Table Text Block]

	Year Ended December 31,
	2023		2022
Interest on cash and cash equivalents	$	1,566	$	194
Dividends on marketable securities		—		219
Net investment income	$	1,566	$	413

Gain (Loss) on Securities [Table Text Block]

	Year Ended December 31,
	2023		2022
Marketable securities (a)	$	384	$	(4,747	)
Net gains (losses)	$	384	$	(4,747	)