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Note 4 - Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 446 |  | $ 438 |  | $ 403 |  | $ 441 |  | $ 524 |  | $ 344 |  | $ 370 |  | $ 417 |  | $ 1,728 | $ 1,655
Net investment income | 549 |  | 544 |  | 275 |  | 198 |  | 352 |  | 54 |  | 10 |  | (3) |  | 1,566 | 413
Net gains (losses) | 0 | [1] | (4) | [1] | 43 | [1] | 345 | [1] | (298) | [1] | (2,121) | [1] | (2,373) | [1] | 45 | [1] | 384 | (4,747)
Total revenues | 995 |  | 978 |  | 721 |  | 984 |  | 578 |  | (1,723) |  | (1,993) |  | 459 |  | 3,678 | (2,679)
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales | 201 |  | 195 |  | 208 |  | 192 |  | 165 |  | 203 |  | 227 |  | 242 |  | 796 | 837
Engineering, selling and administrative | 465 |  | 584 |  | 645 |  | 542 |  | 576 |  | 669 |  | 623 |  | 1,022 |  | 2,236 | 2,890
Total expenses | 666 |  | 779 |  | 853 |  | 734 |  | 741 |  | 872 |  | 850 |  | 1,264 |  | 3,032 | 3,727
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 646 | (6,406)
Income tax expense (benefit) | 169 |  | 69 |  | (2) |  | 65 |  | (164) |  | (611) |  | (588) |  | (166) |  | 301 | (1,529)
Income (loss) from continuing operations | 160 |  | 130 |  | (130) |  | 185 |  | 1 | [2] | (1,984) | [2] | (2,255) | [2] | (639) | [2] | 345 | (4,877)
(Loss) income from discontinued operations, net of tax | 0 |  | 0 |  | 0 |  | (28) |  | 132 |  | 488 |  | 457 |  | 808 |  | (28) | 1,885
Net loss attributable to LGL Group or non-controlling interests | 160 |  | 130 |  | (130) |  | 157 |  | 133 |  | (1,496) |  | (1,798) |  | 169 |  | 317 | (2,992)
Less: Net income attributable to non-controlling interests | 26 |  | 22 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 48 | 0
Net income (loss) attributable to LGL Group common stockholders | $ 134 |  | $ 108 |  | $ (130) |  | $ 157 |  | $ 133 |  | $ (1,496) |  | $ (1,798) |  | $ 169 |  | 269 | (2,992)
Operating Segments [Member] | Electronic Instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,728 | 1,655
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,728 | 1,655
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 796 | 837
Engineering, selling and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 780 | 715
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,576 | 1,552
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152 | 103
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152 | 103
(Loss) income from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net loss attributable to LGL Group or non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152 | 103
Less: Net income attributable to non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net income (loss) attributable to LGL Group common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152 | 103
Operating Segments [Member] | Merchant Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 869 | 0
Net gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 869 | 0
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Engineering, selling and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 216 | 0
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 216 | 0
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 653 | 0
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 653 | 0
(Loss) income from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net loss attributable to LGL Group or non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 653 | 0
Less: Net income attributable to non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 | 0
Net income (loss) attributable to LGL Group common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 605 | 0
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 697 | 413
Net gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 384 | (4,747)
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,081 | (4,334)
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Engineering, selling and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,240 | 2,175
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,240 | 2,175
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (159) | (6,509)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 301 | (1,529)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (460) | (4,980)
(Loss) income from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (28) | 1,885
Net loss attributable to LGL Group or non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (488) | (3,095)
Less: Net income attributable to non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net income (loss) attributable to LGL Group common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (488) | $ (3,095)
[1] | During Q1 and Q2 2023, the net gains primarily relate to the sale of our investments in mutual funds managed by GAMCO Investors, Inc.
[2] | Basic and diluted earnings per share are calculated using actual, unrounded amounts. Therefore, (i) the components of earnings per share may not sum to its corresponding total or (ii) the quarterly earnings per share may not sum to the earnings per share on the Consolidated Statements of Operations.

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