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Pay vs Performance Disclosure - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 28, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Pay vs Performance [Table Text Block] |  |  |  |
Year |  | Summary Compensation Table Total for PEO – Michael E. Scheopner(1) |  |  | Summary Compensation Table Total for PEO – Abigail M. Wendel(1) |  |  | Compensation Actually Paid (CAP) to PEO – Michael E. Scheopner |  |  | Compensation Actually Paid to PEO – Abigail M. Wendel |  |  | Average Summary Compensation Table Totals for non-PEO NEOs(2) |  |  | Average Compensation Actually Paid to Non-PEO NEOs |  |  | Value of Initial Fixed $100 Investment Based on: Total Stockholder Return |  |  | Net Income (dollars in thousands) |
2024 |  | $ | 490,196 |  |  | $ | 863,082 |  |  | $ | 367,890 |  |  | $ | 951,260 |  |  | $ | 446,803 |  |  | $ | 502,245 |  |  | $ | 108.71 |  |  | $ | 13,003 |
2023 |  | $ | 690,405 |  |  |  | — |  |  | $ | 673,367 |  |  |  | — |  |  | $ | 422,465 |  |  | $ | 413,222 |  |  | $ | 81.89 |  |  | $ | 12,236 |
2022 |  | $ | 599,990 |  |  |  | — |  |  | $ | 559,176 |  |  |  | — |  |  | $ | 304,547 |  |  | $ | 288,730 |  |  | $ | 85.57 |  |  | $ | 9,878 |
Named Executive Officers, Footnote [Text Block] |  |  |  |
| (1) | For 2022 and 2023, Landmark’s principal executive officer (“PEO”) was Mr. Scheopner. In 2024, Landmark’s PEO was Mr. Scheopner from January 1, 2024 through March 28, 2024 and Ms. Wendel from March 29, 2024 through December 31, 2024.
Adjustment To PEO Compensation, Footnote [Text Block] |  |  |  | The following tables reconcile the Summary Compensation Table compensation to the Compensation Actually Paid disclosed in the above table.
PEO – Mr. Scheopner SCT Total to CAP Reconciliation
Year |  | SCT-PEO |  |  | Grant Date Fair Value of Equity Awards Granted in Fiscal Year |  |  | Fair Value at Fiscal Year-End of Outstanding and Unvested Equity Awards Granted in Fiscal Year |  |  | Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years |  |  | Change in Fair Value as of Vesting Date of Equity Awards Granted in Prior Fiscal Years for which Applicable Vesting Conditions were Satisfied during the Fiscal Year |  |  | Dividends or Other Earnings Paid on Equity Awards during the Fiscal Year prior to the Vesting Date |  |  | CAP |
2024 |  | $ | 490,196 |  |  | $ | (127,538 | ) |  | $ | 12,557 |  |  | $ | — |  |  | $ | (8,200 | ) |  | $ | 875 |  |  | $ | 367,890 |
2023 |  |  | 690,405 |  |  |  | (75,032 | ) |  |  | 71,153 |  |  |  | (9,343 | ) |  |  | (6,970 | ) |  |  | 3,154 |  |  |  | 673,367 |
2022 |  |  | 599,990 |  |  |  | (74,992 | ) |  |  | 69,904 |  |  |  | 28,844 |  |  |  | (9,992 | ) |  |  | 3,110 |  |  |  | 559,176 |
PEO – Ms. Wendel SCT Total to CAP Reconciliation |
Year |  | SCT-PEO |  |  | Grant Date Fair Value of Equity Awards Granted in Fiscal Year |  |  | Fair Value at Fiscal Year-End of Outstanding and Unvested Equity Awards Granted in Fiscal Year |  |  | Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years |  |  | Change in Fair Value as of Vesting Date of Equity Awards Granted in Prior Fiscal Years for which Applicable Vesting Conditions were Satisfied during the Fiscal Year |  |  | Dividends or Other Earnings Paid on Equity Awards during the Fiscal Year prior to the Vesting Date |  |  | CAP |
2024 |  | $ | 863,082 |  |  | $ | (372,399 | ) |  | $ | 454,913 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,664 |  |  | $ | 951,260 |
2023 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
2022 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Non-PEO NEO Average Total Compensation Amount | [1] |  |  | $ 446,803 | $ 422,465 | $ 304,547
Non-PEO NEO Average Compensation Actually Paid Amount |  |  |  | $ 502,245 | 413,222 | 288,730
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] |  |  |  |
Average Non-PEO SCT Total to CAP Reconciliation |
Year |  | SCT-NEO |  |  | Grant Date Fair Value of Equity Awards Granted in Fiscal Year |  |  | Fair Value at Fiscal Year-End of Outstanding and Unvested Equity Awards Granted in Fiscal Year |  |  | Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years |  |  | Change in Fair Value as of Vesting Date of Equity Awards Granted in Prior Fiscal Years for which Applicable Vesting Conditions were Satisfied during the Fiscal Year |  |  | Dividends or Other Earnings Paid on Equity Awards during the Fiscal Year prior to the Vesting Date |  |  | CAP |
2024 |  | $ | 446,803 |  |  | $ | (59,007 | ) |  | $ | 74,191 |  |  | $ | 37,456 |  |  | $ | 488 |  |  | $ | 2,314 |  |  | $ | 502,245 |
2023 |  |  | 422,465 |  |  |  | (40,018 | ) |  |  | 37,951 |  |  |  | (5,058 | ) |  |  | (3,815 | ) |  |  | 1,697 |  |  |  | 413,222 |
2022 |  |  | 304,547 |  |  |  | (19,997 | ) |  |  | 18,636 |  |  |  | (11,535 | ) |  |  | (4,000 | ) |  |  | 1,079 |  |  |  | 288,730 |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] |  |  |  |  |  |
Compensation Actually Paid vs. Net Income [Text Block] |  |  |  |  |  |
Total Shareholder Return Amount |  |  |  | $ 108.71 | 81.89 | 85.57
Net Income (Loss) Attributable to Parent |  |  |  | $ 13,003,000 | $ 12,236,000 | $ 9,878,000
PEO Name |  | Mr. Scheopner | Ms. Wendel |  | Mr. Scheopner | Mr. Scheopner
Additional 402(v) Disclosure [Text Block] |  |  |  | The valuation assumptions used to calculate equity award fair values in the above tables are prescribed by Item 402(v) of Regulation S-K and did not materially differ from those disclosed at the time of the grant. |  |
Measure [Axis]: 1 |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Measure Name |  |  |  | total stockholder return | total stockholder return | total stockholder return
Measure [Axis]: 2 |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Measure Name |  |  |  | net income | net income | net income
Michael E. Scheopner [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
PEO Total Compensation Amount | [2] |  |  | $ 490,196 | $ 690,405 | $ 599,990
PEO Actually Paid Compensation Amount |  |  |  | 367,890 | 673,367 | 559,176
Michael E. Scheopner [Member] | Grant Date Fair Value of Equity Awards Granted in Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | (127,538) | (75,032) | (74,992)
Michael E. Scheopner [Member] | Fair Value at Fiscal Year-End of Outstanding and Unvested Equity Awards Granted in Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | 12,557 | 71,153 | 69,904
Michael E. Scheopner [Member] | Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  |  | (9,343) | 28,844
Michael E. Scheopner [Member] | Change in Fair Value as of Vesting Date of Equity Awards Granted in Prior Fiscal Years for which Applicable Vesting Conditions were Satisfied during the Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | (8,200) | (6,970) | (9,992)
Michael E. Scheopner [Member] | Dividends or Other Earnings Paid on Equity Awards during the Fiscal Year prior to the Vesting Date [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | 875 | 3,154 | 3,110
Abigail M. Wendel [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
PEO Total Compensation Amount | [2] |  |  | 863,082 |  |
PEO Actually Paid Compensation Amount |  |  |  | 951,260 |  |
Abigail M. Wendel [Member] | Grant Date Fair Value of Equity Awards Granted in Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | (372,399) |  |
Abigail M. Wendel [Member] | Fair Value at Fiscal Year-End of Outstanding and Unvested Equity Awards Granted in Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | 454,913 |  |
Abigail M. Wendel [Member] | Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  |  |  |
Abigail M. Wendel [Member] | Change in Fair Value as of Vesting Date of Equity Awards Granted in Prior Fiscal Years for which Applicable Vesting Conditions were Satisfied during the Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  |  |  |
Abigail M. Wendel [Member] | Dividends or Other Earnings Paid on Equity Awards during the Fiscal Year prior to the Vesting Date [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | 5,664 |  |
Non-PEO NEO [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
PEO Total Compensation Amount |  |  |  | 446,803 | 422,465 | 304,547
PEO Actually Paid Compensation Amount |  |  |  | 502,245 | 413,222 | 288,730
Non-PEO NEO [Member] | Grant Date Fair Value of Equity Awards Granted in Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | (59,007) | (40,018) | (19,997)
Non-PEO NEO [Member] | Fair Value at Fiscal Year-End of Outstanding and Unvested Equity Awards Granted in Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | 74,191 | 37,951 | 18,636
Non-PEO NEO [Member] | Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | 37,456 | (5,058) | (11,535)
Non-PEO NEO [Member] | Change in Fair Value as of Vesting Date of Equity Awards Granted in Prior Fiscal Years for which Applicable Vesting Conditions were Satisfied during the Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | 488 | (3,815) | (4,000)
Non-PEO NEO [Member] | Dividends or Other Earnings Paid on Equity Awards during the Fiscal Year prior to the Vesting Date [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Adjustment to Compensation Amount |  |  |  | $ 2,314 | $ 1,697 | $ 1,079
[1] | For 2022, Landmark’s non-PEO NEOs were Mark A. Herpich and Mark J. Oliphant. For 2023 and 2024, Landmark’s non-PEO NEO was Mark A. Herpich.
[2] | For 2022 and 2023, Landmark’s principal executive officer (“PEO”) was Mr. Scheopner. In 2024, Landmark’s PEO was Mr. Scheopner from January 1, 2024 through March 28, 2024 and Ms. Wendel from March 29, 2024 through December 31, 2024.

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