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Note 3 - Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended September 30, 2025
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 661 |  |  | $ | — |  |  | $ | — |  |  | $ | 661 |
Net investment income |  |  | — |  |  |  | 274 |  |  |  | 168 |  |  |  | 442 |
Net gains |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 5 |
Total revenues |  |  | 661 |  |  |  | 274 |  |  |  | 173 |  |  |  | 1,108 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 312 |  |  |  | — |  |  |  | — |  |  |  | 312 |
Engineering |  |  | 74 |  |  |  | — |  |  |  | — |  |  |  | 74 |
Commissions |  |  | 12 |  |  |  | — |  |  |  | — |  |  |  | 12 |
Sales and marketing |  |  | 47 |  |  |  | — |  |  |  | — |  |  |  | 47 |
Accounting |  |  | — |  |  |  | — |  |  |  | 49 |  |  |  | 49 |
Compensation |  |  | 58 |  |  |  | — |  |  |  | 74 |  |  |  | 132 |
Corporation allocations (a) |  |  | 13 |  |  |  | 145 |  |  |  | (158 | ) |  |  | — |
Other segment items (b) |  |  | 41 |  |  |  | — |  |  |  | 321 |  |  |  | 362 |
Engineering, selling and administrative |  |  | 245 |  |  |  | 145 |  |  |  | 286 |  |  |  | 676 |
Total expenses |  |  | 557 |  |  |  | 145 |  |  |  | 286 |  |  |  | 988 |
Segment profit (loss) |  | $ | 104 |  |  | $ | 129 |  |  | $ | (113 | ) |  | $ | 120 |
Reconciliation of Segment profit (loss) to Income (loss) from operations before income taxes
Adjustments and reconciling items |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |
Income from operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 120 |
|  | Three Months Ended September 30, 2024
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 650 |  |  | $ | — |  |  | $ | — |  |  | $ | 650 |
Net investment income |  |  | — |  |  |  | 318 |  |  |  | 213 |  |  |  | 531 |
Net losses |  |  | — |  |  |  | — |  |  |  | (2 | ) |  |  | (2 | )
Total revenues |  |  | 650 |  |  |  | 318 |  |  |  | 211 |  |  |  | 1,179 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 368 |  |  |  | — |  |  |  | — |  |  |  | 368 |
Engineering |  |  | 54 |  |  |  | — |  |  |  | — |  |  |  | 54 |
Commissions |  |  | 20 |  |  |  | — |  |  |  | — |  |  |  | 20 |
Sales and marketing |  |  | 52 |  |  |  | — |  |  |  | — |  |  |  | 52 |
Accounting |  |  | — |  |  |  | — |  |  |  | 39 |  |  |  | 39 |
Compensation |  |  | 69 |  |  |  | — |  |  |  | 309 |  |  |  | 378 |
Corporation allocations (a) |  |  | 10 |  |  |  | 78 |  |  |  | (88 | ) |  |  | — |
Other segment items (b) |  |  | 33 |  |  |  | 12 |  |  |  | 85 |  |  |  | 130 |
Engineering, selling and administrative |  |  | 238 |  |  |  | 90 |  |  |  | 345 |  |  |  | 673 |
Total expenses |  |  | 606 |  |  |  | 90 |  |  |  | 345 |  |  |  | 1,041 |
Segment profit (loss) |  | $ | 44 |  |  | $ | 228 |  |  | $ | (134 | ) |  | $ | 138 |
Reconciliation of Segment profit (loss) to Income (loss) from operations before income taxes
Adjustments and reconciling items |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |
Income from operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 138 |
|  | Nine Months Ended September 30, 2025
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 1,650 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,650 |
Net investment income |  |  | — |  |  |  | 783 |  |  |  | 504 |  |  |  | 1,287 |
Net gains |  |  | — |  |  |  | — |  |  |  | 13 |  |  |  | 13 |
Total revenues |  |  | 1,650 |  |  |  | 783 |  |  |  | 517 |  |  |  | 2,950 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 760 |  |  |  | — |  |  |  | — |  |  |  | 760 |
Engineering |  |  | 188 |  |  |  | — |  |  |  | — |  |  |  | 188 |
Commissions |  |  | 52 |  |  |  | — |  |  |  | — |  |  |  | 52 |
Sales and marketing |  |  | 139 |  |  |  | — |  |  |  | — |  |  |  | 139 |
Accounting |  |  | — |  |  |  | — |  |  |  | 174 |  |  |  | 174 |
Compensation |  |  | 166 |  |  |  | — |  |  |  | 423 |  |  |  | 589 |
Corporation allocations (a) |  |  | 35 |  |  |  | 331 |  |  |  | (366 | ) |  |  | — |
Other segment items (b) |  |  | 119 |  |  |  | 22 |  |  |  | 777 |  |  |  | 918 |
Engineering, selling and administrative |  |  | 699 |  |  |  | 353 |  |  |  | 1,008 |  |  |  | 2,060 |
Total expenses |  |  | 1,459 |  |  |  | 353 |  |  |  | 1,008 |  |  |  | 2,820 |
Segment profit (loss) |  | $ | 191 |  |  | $ | 430 |  |  | $ | (491 | ) |  | $ | 130 |
Reconciliation of Segment profit (loss) to Income (loss) from operations before income taxes |
Adjustments and reconciling items |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |
Income from operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 130 |
|  | Nine Months Ended September 30, 2024
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 1,573 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,573 |
Net investment income |  |  | — |  |  |  | 922 |  |  |  | 646 |  |  |  | 1,568 |
Net losses |  |  | — |  |  |  | — |  |  |  | (6 | ) |  |  | (6 | )
Total revenues |  |  | 1,573 |  |  |  | 922 |  |  |  | 640 |  |  |  | 3,135 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 786 |  |  |  | — |  |  |  | — |  |  |  | 786 |
Engineering |  |  | 141 |  |  |  | — |  |  |  | — |  |  |  | 141 |
Commissions |  |  | 75 |  |  |  | — |  |  |  | — |  |  |  | 75 |
Sales and marketing |  |  | 132 |  |  |  | — |  |  |  | — |  |  |  | 132 |
Accounting |  |  | — |  |  |  | — |  |  |  | 227 |  |  |  | 227 |
Compensation |  |  | 189 |  |  |  | — |  |  |  | 585 |  |  |  | 774 |
Corporation allocations (a) |  |  | 29 |  |  |  | 204 |  |  |  | (233 | ) |  |  | — |
Other segment items (b) |  |  | 101 |  |  |  | 13 |  |  |  | 432 |  |  |  | 546 |
Engineering, selling and administrative |  |  | 667 |  |  |  | 217 |  |  |  | 1,011 |  |  |  | 1,895 |
Total expenses |  |  | 1,453 |  |  |  | 217 |  |  |  | 1,011 |  |  |  | 2,681 |
Segment profit (loss) |  | $ | 120 |  |  | $ | 705 |  |  | $ | (371 | ) |  | $ | 454 |
Reconciliation of Segment profit (loss) to Income (loss) from operations before income taxes
Adjustments and reconciling items |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |
Income from operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 454 |
Segment, Reconciliation of Other Items from Segments to Consolidated [Table Text Block] |
|  | Three Months Ended September 30, 2025
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Interest revenue (a) |  | $ | — |  |  | $ | 274 |  |  | $ | 168 |  |  | $ | 442 |  |  | $ | — |  |  | $ | 442 |
Amortization (b) |  |  | (27 | ) |  |  | — |  |  |  | — |  |  |  | (27 | ) |  |  | — |  |  |  | (27 | )
Other significant non-cash items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation (c) |  |  | — |  |  |  | — |  |  |  | (18 | ) |  |  | (18 | ) |  |  | — |  |  |  | (18 | )
Capital expenditures |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  | Three Months Ended September 30, 2024
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Interest revenue (a) |  | $ | — |  |  | $ | 318 |  |  | $ | 213 |  |  | $ | 531 |  |  | $ | — |  |  | $ | 531 |
Amortization (b) |  |  | (11 | ) |  |  | — |  |  |  | — |  |  |  | (11 | ) |  |  | — |  |  |  | (11 | )
Other significant non-cash items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation (c) |  |  | — |  |  |  | — |  |  |  | (9 | ) |  |  | (9 | ) |  |  | — |  |  |  | (9 | )
Capital expenditures |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  | Nine Months Ended September 30, 2025
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Interest revenue (a) |  | $ | — |  |  | $ | 783 |  |  | $ | 504 |  |  | $ | 1,287 |  |  | $ | — |  |  | $ | 1,287 |
Amortization (b) |  |  | (16 | ) |  |  | — |  |  |  | — |  |  |  | (16 | ) |  |  | — |  |  |  | (16 | )
Other significant non-cash items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation (c) |  |  | — |  |  |  | — |  |  |  | (44 | ) |  |  | (44 | ) |  |  | — |  |  |  | (44 | )
Capital expenditures |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  | Nine Months Ended September 30, 2024
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Interest revenue (a) |  | $ | — |  |  | $ | 922 |  |  | $ | 646 |  |  | $ | 1,568 |  |  | $ | — |  |  | $ | 1,568 |
Amortization (b) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Other significant non-cash items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation (c) |  |  | — |  |  |  | — |  |  |  | (27 | ) |  |  | (27 | ) |  |  | — |  |  |  | (27 | )
Capital expenditures |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | September 30, 2025
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Total assets |  | $ | 1,223 |  |  | $ | 25,508 |  |  | $ | 16,553 |  |  | $ | 43,284 |  |  | $ | — |  |  | $ | 43,284 |
|  | December 31, 2024
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Total |  | Adjustments and Reconciling Items |  | Consolidated
Total assets |  | $ | 1,249 |  |  | $ | 24,748 |  |  | $ | 17,148 |  |  | $ | 43,145 |  |  | $ | — |  |  | $ | 43,145 |

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