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Note 3 - Segment Information (Tables) | 12 Months Ended
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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 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |

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