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Note 3 - Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Net sales |  | $ (653) |  | $ (650) |  | $ (531) |  | $ (392) |  | $ (446) |  | $ (438) |  | $ (403) |  | $ (441) |  | $ (2,226) | $ (1,728)
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,071) | (1,566)
Net (losses) gains |  | (1) | [1] | 2 | [1] | 1 | [1] | 3 | [1] | 0 | [1] | 4 | [1] | (43) | [1] | (345) | [1] | 5 | (384)
Total revenues |  | 1,157 |  | 1,179 |  | 1,068 |  | 888 |  | 995 |  | 978 |  | 721 |  | 984 |  | 4,292 | 3,678
Manufacturing cost of sales |  | 261 |  | 368 |  | 214 |  | 204 |  | 201 |  | 195 |  | 208 |  | 192 |  | 1,047 | 796
Engineering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 209 | 248
Commissions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112 | 99
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 185 | 11
Accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 270 | 339
Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,022 | 591
Corporate allocations (a) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Other segment items (b) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 748 | 948
Engineering, selling and administrative |  | 651 |  | 673 |  | 617 |  | 605 |  | 465 |  | 584 |  | 645 |  | 542 |  | 2,546 | 2,236
Total expenses |  | 912 |  | 1,041 |  | 831 |  | 809 |  | 666 |  | 779 |  | 853 |  | 734 |  | 3,593 | 3,032
Segment profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 699 | 646
Income before income taxes |  | 245 |  | 138 |  | 237 |  | 79 |  | 329 |  | 199 |  | (132) |  | 250 |  | 699 | 646
Net sales |  | 653 |  | 650 |  | 531 |  | 392 |  | 446 |  | 438 |  | 403 |  | 441 |  | 2,226 | 1,728
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,071 | 1,566
Net (losses) gains |  | $ 1 | [1] | $ (2) | [1] | $ (1) | [1] | $ (3) | [1] | $ 0 | [1] | $ (4) | [1] | $ 43 | [1] | $ 345 | [1] | (5) | 384
Operating Segments [Member] | Electronic Instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,226) | (1,728)
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,226 | 1,728
Manufacturing cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,047 | 796
Engineering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 209 | 248
Commissions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112 | 99
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 185 | 11
Accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 243 | 224
Corporate allocations (a) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42 | 35
Other segment items (b) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145 | 163
Engineering, selling and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 936 | 780
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,983 | 1,576
Segment profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 243 | 152
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,226 | 1,728
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Operating Segments [Member] | Merchant Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,228) | (869)
Net (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,228 | 869
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) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 371 | 189
Other segment items (b) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 27
Engineering, selling and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 381 | 216
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 381 | 216
Segment profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 847 | 653
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,228 | 869
Net (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (843) | (697)
Net (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | (384)
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 838 | 1,081
Manufacturing cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Engineering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Commissions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 270 | 339
Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 779 | 367
Corporate allocations (a) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (413) | (224)
Other segment items (b) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 593 | 758
Engineering, selling and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,229 | 1,240
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,229 | 1,240
Segment profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (391) | (159)
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 843 | 697
Net (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (5) | $ 384
[1] | During Q1 and Q2 2023, the net gains primarily relate to the sale of our investments in mutual funds managed by GAMCO Investors, Inc.
[2] | The Electronic Instruments and Merchant Investment segments are allocated overhead expenses from the Corporate segment based on each segment's assets as a percentage of Total assets.
[3] | 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 MtronPTI under Amended and Restated Transitional Administrative and Management Services Agreement, and certain other overhead expenses.

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