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Note 3 - Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Net sales |  | $ 682 | $ 498
Net investment income |  | 389 | 417
Net gains |  | 14 | 3
Total revenues |  | 1,085 | 918
Manufacturing cost of sales |  | 334 | 237
Engineering |  | 90 | 57
Commissions |  | 25 | 19
Sales and marketing |  | 63 | 57
Accounting |  | 70 | 75
Compensation |  | 871 | 248
Corporate allocations (a) | [1] | 0 | 0
Other segment items (b) | [2] | 417 | 184
Engineering, selling and administrative |  | 1,536 | 640
Total expenses |  | 1,870 | 877
Segment profit (loss) |  | (785) | 41
Loss before income taxes |  | (785) | 41
Net gains (losses) |  | 14 | 3
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |
Net sales |  | 0 | 0
Net investment income |  | 166 | 170
Net gains |  | 14 | 3
Total revenues |  | 180 | 173
Manufacturing cost of sales |  | 0 | 0
Engineering |  | 0 | 0
Commissions |  | 0 | 0
Sales and marketing |  | 0 | 0
Accounting |  | 70 | 75
Compensation |  | 813 | 192
Corporate allocations (a) | [1] | (141) | (104)
Other segment items (b) | [2] | 338 | 141
Engineering, selling and administrative |  | 1,080 | 304
Total expenses |  | 1,080 | 304
Segment profit (loss) |  | (900) | (131)
Loss before income taxes |  |  |
Net gains (losses) |  | 14 | 3
Electronic Instruments [Member] | Operating Segments [Member] |  |  |
Net sales |  | 682 | 498
Net investment income |  | 0 | 0
Net gains |  | 0 | 0
Total revenues |  | 682 | 498
Manufacturing cost of sales |  | 334 | 237
Engineering |  | 90 | 57
Commissions |  | 25 | 19
Sales and marketing |  | 63 | 57
Accounting |  | 0 | 0
Compensation |  | 58 | 56
Corporate allocations (a) | [1] | 16 | 11
Other segment items (b) | [2] | 79 | 42
Engineering, selling and administrative |  | 331 | 242
Total expenses |  | 665 | 479
Segment profit (loss) |  | 17 | 19
Loss before income taxes |  |  |
Net gains (losses) |  | 0 | 0
Merchant Investment [Member] | Operating Segments [Member] |  |  |
Net sales |  | 0 | 0
Net investment income |  | 223 | 247
Net gains |  | 0 | 0
Total revenues |  | 223 | 247
Manufacturing cost of sales |  | 0 | 0
Engineering |  | 0 | 0
Commissions |  | 0 | 0
Sales and marketing |  | 0 | 0
Accounting |  | 0 | 0
Compensation |  | 0 | 0
Corporate allocations (a) | [1] | 125 | 93
Other segment items (b) | [2] | 0 | 1
Engineering, selling and administrative |  | 125 | 94
Total expenses |  | 125 | 94
Segment profit (loss) |  | 98 | 153
Loss before income taxes |  |  |
Net gains (losses) |  | $ 0 | $ 0
[1] | The Electronic Instruments and Merchant Investment segments are allocated overhead expenses from the Corporate segment based on each segment's asset as a percentage of Total assets.
[2] | Other segment items for each reportable segment includes the following: Electronic Instruments - rent, amortization, professional service fees, and certain other overhead expenses. Merchant Investment - legal expense and certain other overhead expenses. Corporate - legal expense, insurance expense, filing fees, fees paid to M-tron Industries, Inc. under Amended and Restated Transitional Administrative and Management Services Agreement, expense reimbursements paid to / received from M-tron Industries, Inc., and certain other overhead expenses.

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