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Note 4 - Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | 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 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 796 |  |  |  | — |  |  |  | — |  |  |  | 796 |
Engineering, selling and administrative |  |  | 780 |  |  |  | 216 |  |  |  | 1,240 |  |  |  | 2,236 |
Total expenses |  |  | 1,576 |  |  |  | 216 |  |  |  | 1,240 |  |  |  | 3,032 |
Income (loss) from continuing operations before income taxes |  |  | 152 |  |  |  | 653 |  |  |  | (159 | ) |  |  | 646 |
Income tax expense (benefit) |  |  | — |  |  |  | — |  |  |  | 301 |  |  |  | 301 |
Income (loss) from continuing operations |  |  | 152 |  |  |  | 653 |  |  |  | (460 | ) |  |  | 345 |
Income (loss) from discontinued operations |  |  | — |  |  |  | — |  |  |  | (28 | ) |  |  | (28 | )
Net income (loss) |  |  | 152 |  |  |  | 653 |  |  |  | (488 | ) |  |  | 317 |
Less: Net income attributable to non-controlling interests |  |  | — |  |  |  | 48 |  |  |  | — |  |  |  | 48 |
Net income (loss) attributable to LGL Group common stockholders |  | $ | 152 |  |  | $ | 605 |  |  | $ | (488 | ) |  | $ | 269 |
|  | Year Ended December 31, 2022
|  | Electronic Instruments |  | Merchant Investment |  | Corporate |  | Consolidated
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 1,655 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,655 |
Net investment income |  |  | — |  |  |  | — |  |  |  | 413 |  |  |  | 413 |
Net losses |  |  | — |  |  |  | — |  |  |  | (4,747 | ) |  |  | (4,747 | )
Total revenues |  |  | 1,655 |  |  |  | — |  |  |  | (4,334 | ) |  |  | (2,679 | )
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  | 837 |  |  |  | — |  |  |  | — |  |  |  | 837 |
Engineering, selling and administrative |  |  | 715 |  |  |  | — |  |  |  | 2,175 |  |  |  | 2,890 |
Total expenses |  |  | 1,552 |  |  |  | — |  |  |  | 2,175 |  |  |  | 3,727 |
Income (loss) from continuing operations before income taxes |  |  | 103 |  |  |  | — |  |  |  | (6,509 | ) |  |  | (6,406 | )
Income tax benefit |  |  | — |  |  |  | — |  |  |  | (1,529 | ) |  |  | (1,529 | )
Income (loss) from continuing operations |  |  | 103 |  |  |  | — |  |  |  | (4,980 | ) |  |  | (4,877 | )
Income from discontinued operations |  |  | — |  |  |  | — |  |  |  | 1,885 |  |  |  | 1,885 |
Net income (loss) |  |  | 103 |  |  |  | — |  |  |  | (3,095 | ) |  |  | (2,992 | )
Less: Net income attributable to non-controlling interests |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net income (loss) attributable to LGL Group common stockholders |  | $ | 103 |  |  | $ | — |  |  | $ | (3,095 | ) |  | $ | (2,992 | )
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | Year-End Identifiable Assets |  | Capital Expenditures
|  | 2023 |  | 2022 |  | 2023 |  | 2022
Electronic Instruments |  | $ | 843 |  |  | $ | 1,118 |  |  | $ | — |  |  | $ | — |
Merchant Investment |  |  | 23,530 |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate |  |  | 17,477 |  |  |  | 38,667 |  |  |  | — |  |  |  | — |
Total |  | $ | 41,850 |  |  | $ | 39,785 |  |  | $ | — |  |  | $ | — |

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