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Note 3 - Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2026
Notes Tables |
Segment Reporting [Table Text Block] |
|  | Three Months Ended March 31, 2026
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 682 |  |  | $ | — |  |  | $ | — |  |  | $ | 682 |
Net investment income |  |  | — |  |  |  | 223 |  |  |  | 166 |  |  |  | 389 |
Net gains |  |  | — |  |  |  | — |  |  |  | 14 |  |  |  | 14 |
Total revenues |  |  | 682 |  |  |  | 223 |  |  |  | 180 |  |  |  | 1,085 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 334 |  |  |  | — |  |  |  | — |  |  |  | 334 |
Engineering |  |  | 90 |  |  |  | — |  |  |  | — |  |  |  | 90 |
Commissions |  |  | 25 |  |  |  | — |  |  |  | — |  |  |  | 25 |
Sales and marketing |  |  | 63 |  |  |  | — |  |  |  | — |  |  |  | 63 |
Accounting |  |  | — |  |  |  | — |  |  |  | 70 |  |  |  | 70 |
Compensation |  |  | 58 |  |  |  | — |  |  |  | 813 |  |  |  | 871 |
Corporate allocations (a) |  |  | 16 |  |  |  | 125 |  |  |  | (141 | ) |  |  | — |
Other segment items (b) |  |  | 79 |  |  |  | — |  |  |  | 338 |  |  |  | 417 |
Engineering, selling and administrative |  |  | 331 |  |  |  | 125 |  |  |  | 1,080 |  |  |  | 1,536 |
Total expenses |  |  | 665 |  |  |  | 125 |  |  |  | 1,080 |  |  |  | 1,870 |
Segment profit (loss) |  | $ | 17 |  |  | $ | 98 |  |  | $ | (900 | ) |  | $ | (785 | )
Reconciliation of Segment profit (loss) to Income (loss) before income taxes |
Adjustments and reconciling items |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (785 | )
|  | Three Months Ended March 31, 2025
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 498 |  |  | $ | — |  |  | $ | — |  |  | $ | 498 |
Net investment income |  |  | — |  |  |  | 247 |  |  |  | 170 |  |  |  | 417 |
Net gains |  |  | — |  |  |  | — |  |  |  | 3 |  |  |  | 3 |
Total revenues |  |  | 498 |  |  |  | 247 |  |  |  | 173 |  |  |  | 918 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 237 |  |  |  | — |  |  |  | — |  |  |  | 237 |
Engineering |  |  | 57 |  |  |  | — |  |  |  | — |  |  |  | 57 |
Commissions |  |  | 19 |  |  |  | — |  |  |  | — |  |  |  | 19 |
Sales and marketing |  |  | 57 |  |  |  | — |  |  |  | — |  |  |  | 57 |
Accounting |  |  | — |  |  |  | — |  |  |  | 75 |  |  |  | 75 |
Compensation |  |  | 56 |  |  |  | — |  |  |  | 192 |  |  |  | 248 |
Corporate allocations (a) |  |  | 11 |  |  |  | 93 |  |  |  | (104 | ) |  |  | — |
Other segment items (b) |  |  | 42 |  |  |  | 1 |  |  |  | 141 |  |  |  | 184 |
Engineering, selling and administrative |  |  | 242 |  |  |  | 94 |  |  |  | 304 |  |  |  | 640 |
Total expenses |  |  | 479 |  |  |  | 94 |  |  |  | 304 |  |  |  | 877 |
Segment profit (loss) |  | $ | 19 |  |  | $ | 153 |  |  | $ | (131 | ) |  | $ | 41 |
Reconciliation of Segment profit (loss) to Income (loss) before income taxes |
Adjustments and reconciling items |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 41 |
Segment Reporting, Reconciliation of Other Item by Segment to Consolidated [Table Text Block] |
|  | Three Months Ended March 31, 2026
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Interest revenue (a) |  | $ | — |  |  | $ | 223 |  |  | $ | 166 |  |  | $ | 389 |  |  | $ | — |  |  | $ | 389 |
Amortization (b) |  |  | 6 |  |  |  | — |  |  |  | — |  |  |  | 6 |  |  |  | — |  |  |  | 6 |
Other significant non-cash items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation (c) |  |  | — |  |  |  | — |  |  |  | 688 |  |  |  | 688 |  |  |  | — |  |  |  | 688 |
Capital expenditures |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  | Three Months Ended March 31, 2025
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Interest revenue (a) |  | $ | — |  |  | $ | 247 |  |  | $ | 170 |  |  | $ | 417 |  |  | $ | — |  |  | $ | 417 |
Amortization (b) |  |  | 6 |  |  |  | — |  |  |  | — |  |  |  | 6 |  |  |  | — |  |  |  | 6 |
Other significant non-cash items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation (c) |  |  | — |  |  |  | — |  |  |  | 9 |  |  |  | 9 |  |  |  | — |  |  |  | 9 |
Capital expenditures |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Segment Reporting, Reconciliation of Asset by Segment to Consolidated [Table Text Block] |
|  | March 31, 2026
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Total assets |  | $ | 1,303 |  |  | $ | 25,991 |  |  | $ | 20,829 |  |  | $ | 48,123 |  |  | $ | — |  |  | $ | 48,123 |
|  | December 31, 2025
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Total assets |  | $ | 1,237 |  |  | $ | 25,768 |  |  | $ | 19,771 |  |  | $ | 46,776 |  |  | $ | — |  |  | $ | 46,776 |

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