Note 4 - Investments (Tables)

9 Months Ended

Sep. 30, 2026

Notes Tables

Marketable Securities [Table Text Block]

	September 30, 2026
					Cumulative
					Unrealized
	Fair Value		Basis		Gain
Equity securities	$	41	$	34	$	7
Total	$	41	$	34	$	7

	December 31, 2025
					Cumulative
					Unrealized
	Fair Value		Basis		Gain
Equity securities	$	36	$	34	$	2
Total	$	36	$	34	$	2

Securities Owned and Other Investments Not Readily Marketable Disclosure [Table Text Block]

	September 30, 2026					December 31, 2025
	Fair Value		% of Total			Fair Value		% of Total
Convertible promissory note	$	2,520		100	%	$	—		0	%
Total	$	2,520		100	%	$	—		0	%

Investment Income [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Interest on cash and cash equivalents	$	695	$	442	$	1,489	$	1,287
Interest on convertible promissory note		49		—		56		—
Net investment income	$	744	$	442	$	1,545	$	1,287

Gain (Loss) on Securities [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Marketable securities	$	—	$	5	$	5	$	13
Net gains (losses)	$	—	$	5	$	5	$	13