Note 3 - Segment Information (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Year Ended December 31, 2024
	Electronic Instruments		Merchant Investment		Corporate			Consolidated
Revenues:
Net sales	$	2,226	$	—	$	—		$	2,226
Net investment income		—		1,228		843			2,071
Net losses		—		—		(5	)		(5	)
Total revenues		2,226		1,228		838			4,292
Less:
Manufacturing cost of sales		1,047		—		—			1,047
Engineering		209		—		—			209
Commissions		112		—		—			112
Sales and marketing		185		—		—			185
Accounting		—		—		270			270
Compensation		243		—		779			1,022
Corporate allocations (a)		42		371		(413	)		—
Other segment items (b)		145		10		593			748
Engineering, selling and administrative		936		381		1,229			2,546
Total expenses		1,983		381		1,229			3,593
Segment profit (loss)	$	243	$	847	$	(391	)	$	699
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income taxes
Adjustments and reconciling items									—
Income from continuing operations before income taxes								$	699

	Year Ended December 31, 2023
	Electronic Instruments		Merchant Investment		Corporate			Consolidated
Revenues:
Net sales	$	1,728	$	—	$	—		$	1,728
Net investment income		—		869		697			1,566
Net gains		—		—		384			384
Total revenues		1,728		869		1,081			3,678
Less:
Manufacturing cost of sales		796		—		—			796
Engineering		248		—		—			248
Commissions		99		—		—			99
Sales and marketing		11		—		—			11
Accounting		—		—		339			339
Compensation		224		—		367			591
Corporate allocations (a)		35		189		(224	)		—
Other segment items (b)		163		27		758			948
Engineering, selling and administrative		780		216		1,240			2,236
Total expenses		1,576		216		1,240			3,032
Segment profit (loss)	$	152	$	653	$	(159	)	$	646
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income taxes
Adjustments and reconciling items									—
Income from continuing operations before income taxes								$	646

Segment, Reconciliation of Other Items from Segments to Consolidated [Table Text Block]

	As of and For Year Ended December 31, 2024
	Electronic Instruments		Merchant Investment		Corporate		Total		Adjustments and Reconciling Items		Consolidated
Interest revenue (a)	$	—	$	1,227	$	843	$	2,070	$	—	$	2,070
Depreciation (b)		—		—		—		—		—		—
Amortization (b)		21		—		—		21		—		21
Other significant non-cash items:
Stock-based compensation (c)		—		—		36		36		—		36
Total assets		1,249		24,748		17,148		43,145		—		43,145
Capital expenditures		—		—		—		—		—		—

	As of and For Year Ended December 31, 2023
	Electronic Instruments		Merchant Investment		Corporate		Total		Adjustments and Reconciling Items		Consolidated
Interest revenue (a)	$	—	$	869	$	697	$	1,566	$	—	$	1,566
Depreciation (b)		1		—		—		1		—		1
Amortization (b)		21		—		—		21		—		21
Other significant non-cash items:
Stock-based compensation (c)		—		—		3		3		—		3
Total assets		843		23,530		17,477		41,850		—		41,850
Capital expenditures		—		—		—		—		—		—