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Note 3 - Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended June 30, 2024
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 531 |  |  | $ | — |  |  | $ | — |  |  | $ | 531 |
Net investment income |  |  | — |  |  |  | 315 |  |  |  | 223 |  |  |  | 538 |
Net (losses) gains |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (1 | )
Total revenues |  |  | 531 |  |  |  | 315 |  |  |  | 222 |  |  |  | 1,068 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 214 |  |  |  | — |  |  |  | — |  |  |  | 214 |
Engineering, selling and administrative |  |  | 243 |  |  |  | 78 |  |  |  | 296 |  |  |  | 617 |
Total expenses |  |  | 457 |  |  |  | 78 |  |  |  | 296 |  |  |  | 831 |
Income (loss) from continuing operations before income taxes |  |  | 74 |  |  |  | 237 |  |  |  | (74 | ) |  |  | 237 |
Income tax expense |  |  | — |  |  |  | — |  |  |  | 76 |  |  |  | 76 |
Net income (loss) from continuing operations |  |  | 74 |  |  |  | 237 |  |  |  | (150 | ) |  |  | 161 |
Income (loss) from discontinued operations, net of tax |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net income (loss) |  |  | 74 |  |  |  | 237 |  |  |  | (150 | ) |  |  | 161 |
Less: Net income attributable to non-controlling interests |  |  | — |  |  |  | 24 |  |  |  | — |  |  |  | 24 |
Net income (loss) attributable to LGL Group common stockholders |  | $ | 74 |  |  | $ | 213 |  |  | $ | (150 | ) |  | $ | 137 |
|  | Three Months Ended June 30, 2023
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 403 |  |  | $ | — |  |  | $ | — |  |  | $ | 403 |
Net investment income |  |  | — |  |  |  | — |  |  |  | 275 |  |  |  | 275 |
Net (losses) gains |  |  | — |  |  |  | — |  |  |  | 43 |  |  |  | 43 |
Total revenues |  |  | 403 |  |  |  | — |  |  |  | 318 |  |  |  | 721 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 208 |  |  |  | — |  |  |  | — |  |  |  | 208 |
Engineering, selling and administrative |  |  | 173 |  |  |  | — |  |  |  | 472 |  |  |  | 645 |
Total expenses |  |  | 381 |  |  |  | — |  |  |  | 472 |  |  |  | 853 |
Income (loss) from continuing operations before income taxes |  |  | 22 |  |  |  | — |  |  |  | (154 | ) |  |  | (132 | )
Income tax expense (benefit) |  |  | — |  |  |  | — |  |  |  | (2 | ) |  |  | (2 | )
Net income (loss) from continuing operations |  |  | 22 |  |  |  | — |  |  |  | (152 | ) |  |  | (130 | )
Income (loss) from discontinued operations, net of tax |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net income (loss) |  |  | 22 |  |  |  | — |  |  |  | (152 | ) |  |  | (130 | )
Less: Net income attributable to non-controlling interests |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net income (loss) attributable to LGL Group common stockholders |  | $ | 22 |  |  | $ | — |  |  | $ | (152 | ) |  | $ | (130 | )
|  | Six Months Ended June 30, 2024
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 923 |  |  | $ | — |  |  | $ | — |  |  | $ | 923 |
Net investment income |  |  | — |  |  |  | 604 |  |  |  | 433 |  |  |  | 1,037 |
Net (losses) gains |  |  | — |  |  |  | — |  |  |  | (4 | ) |  |  | (4 | )
Total revenues |  |  | 923 |  |  |  | 604 |  |  |  | 429 |  |  |  | 1,956 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 418 |  |  |  | — |  |  |  | — |  |  |  | 418 |
Engineering, selling and administrative |  |  | 429 |  |  |  | 127 |  |  |  | 666 |  |  |  | 1,222 |
Total expenses |  |  | 847 |  |  |  | 127 |  |  |  | 666 |  |  |  | 1,640 |
Income (loss) from continuing operations before income taxes |  |  | 76 |  |  |  | 477 |  |  |  | (237 | ) |  |  | 316 |
Income tax expense |  |  | — |  |  |  | — |  |  |  | 112 |  |  |  | 112 |
Net income (loss) from continuing operations |  |  | 76 |  |  |  | 477 |  |  |  | (349 | ) |  |  | 204 |
Income (loss) from discontinued operations, net of tax |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net income (loss) |  |  | 76 |  |  |  | 477 |  |  |  | (349 | ) |  |  | 204 |
Less: Net income attributable to non-controlling interests |  |  | — |  |  |  | 46 |  |  |  | — |  |  |  | 46 |
Net income (loss) attributable to LGL Group common stockholders |  | $ | 76 |  |  | $ | 431 |  |  | $ | (349 | ) |  | $ | 158 |
|  | Six Months Ended June 30, 2023
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 844 |  |  | $ | — |  |  | $ | — |  |  | $ | 844 |
Net investment income |  |  | — |  |  |  | — |  |  |  | 473 |  |  |  | 473 |
Net (losses) gains |  |  | — |  |  |  | — |  |  |  | 388 |  |  |  | 388 |
Total revenues |  |  | 844 |  |  |  | — |  |  |  | 861 |  |  |  | 1,705 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 400 |  |  |  | — |  |  |  | — |  |  |  | 400 |
Engineering, selling and administrative |  |  | 350 |  |  |  | — |  |  |  | 837 |  |  |  | 1,187 |
Total expenses |  |  | 750 |  |  |  | — |  |  |  | 837 |  |  |  | 1,587 |
Income (loss) from continuing operations before income taxes |  |  | 94 |  |  |  | — |  |  |  | 24 |  |  |  | 118 |
Income tax expense |  |  | — |  |  |  | — |  |  |  | 63 |  |  |  | 63 |
Net income (loss) from continuing operations |  |  | 94 |  |  |  | — |  |  |  | (39 | ) |  |  | 55 |
Income (loss) from discontinued operations, net of tax |  |  | — |  |  |  | — |  |  |  | (28 | ) |  |  | (28 | )
Net income (loss) |  |  | 94 |  |  |  | — |  |  |  | (67 | ) |  |  | 27 |
Less: Net income attributable to non-controlling interests |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net income (loss) attributable to LGL Group common stockholders |  | $ | 94 |  |  | $ | — |  |  | $ | (67 | ) |  | $ | 27 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | June 30, 2024 |  | December 31, 2023
Electronic Instruments |  | $ | 835 |  |  | $ | 843 |
Merchant Investment |  |  | 24,134 |  |  |  | 23,530 |
Corporate |  |  | 17,278 |  |  |  | 17,477 |
Total |  | $ | 42,247 |  |  | $ | 41,850 |

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