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Note 3 - Segment Information | 3 Months Ended
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Mar. 31, 2026
Notes to Financial Statements |
Segment Reporting [Text Block] | 3. Segment Information Chief Operating Decision Maker The Company's chief operating decision maker ("CODM") is the Chief Executive Officer. Reportable Segments The Company reports its results from operations consistent with the manner in which the CODM reviews the business to assess performance and allocation resources. As such, the Company reports its results in two business segments: Electronic Instruments and Merchant Investment. A brief description of each segment is below: The Electronic Instruments segment includes all products manufactured and sold by PTF. The Merchant Investment segment includes all activity produced by Lynch Capital International, LLC ("Lynch Capital"). The Company includes in Corporate the following corporate and business activities:
| • | corporate level assets and financial obligations such as cash and cash equivalents invested in highly liquid U.S. Treasury money market funds and other marketable securities;
| • | other items not allocated to or directly related to the Company's operating segments, including items such as deferred tax balances; and
| • | intercompany eliminations.
Measure of Segment Profit or Loss and Segment Assets The accounting policies used in both the Electronic Instruments and Merchant Investment segments are the same as those described in Note 2 – Summary of Significant Accounting Policies. The CODM assess the performance of and decide how to allocate resources to each reporting segment based on Segment profit (loss), which is total revenues less Manufacturing cost of sales and Engineering, selling, and administrative. The CODM uses Segment profit (loss) to evaluate the overall profitability of the Electronic Instruments, Merchant Investment, and Corporate segments. Additionally, the CODM uses Segment profit (loss) to allocate resources in the annual budgeting and forecasting process. The CODM considers budget-to-actual variances when making decisions about allocating capital to each segment. The measure of segment assets is reported on the Condensed Consolidated Balance Sheets as consolidated Total assets. The CODM uses Total assets of each segment to allocate overhead expenses incurred by the Corporate segment. The following tables present LGL Group's operations by segment:
|  | 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 |
(a) | 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.
(b) | 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.
Other Segment Disclosures The following tables presents other segment information by segment for the three months ended March 31, 2026 and 2025:
|  | 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 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
(a) | Interest revenue is included in Net investment income on the Condensed Consolidated Statements of Operations.
(b) | Amortization is included within the other segment expense captions. such as Manufacturing cost of sales, Engineering, or Other segment items.
(c) | Stock-based compensation is included within the Compensation expense caption.
The following tables present other segment information by segment as of March 31, 2026 and December 31, 2025:
|  | 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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