S000001302 [Member] Performance Management - TWEEDY, BROWNE INTERNATIONAL VALUE FUND |
Mar. 31, 2025 |
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| Prospectus [Line Items] | ||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Fund Performance | |||||||||||||||||||||
| Performance Narrative [Text Block] | The following bar chart and table illustrate how the returns of the Fund vary over time and how they compare to relevant market benchmarks. This information may help illustrate the risks of investing in the Fund. The Fund has changed its comparative broad-based securities market index from MSCI EAFE Index (Hedged to U.S.$) to the MSCI EAFE Index (in U.S.$) in order to comply with new regulatory requirements regarding the presentation of comparative index performance. Updated performance information for the Fund is available at www.tweedyfunds.com or by calling 800‑432‑4789 (press 0). As with all mutual funds, past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
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| Performance Past Does Not Indicate Future [Text] | As with all mutual funds, past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. | |||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The following bar chart and table illustrate how the returns of the Fund vary over time and how they compare to relevant market benchmarks. | |||||||||||||||||||||
| Bar Chart [Heading] | International Value Fund Calendar Year Total Returns1 | |||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Return for Periods Ended December 31, 2024 | |||||||||||||||||||||
| Performance Table Narrative | After‑tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some instances, the “Return after Taxes on Distributions and Sale of Fund Shares” may be greater than “Return before Taxes” because the investor is assumed to have a capital loss upon the sale of Fund shares to offset other taxable gains. Actual after‑tax returns depend on the investor’s tax situation and may differ from those shown. After‑tax returns shown are not relevant to investors who hold their Fund shares through tax‑deferred arrangements, such as 401(k) plans or individual retirement accounts. The performance data shown above would have been lower had fees not been waived during certain periods.
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| Performance Table Market Index Changed | The Fund has changed its comparative broad-based securities market index from MSCI EAFE Index (Hedged to U.S.$) to the MSCI EAFE Index (in U.S.$) in order to comply with new regulatory requirementsregarding the presentation of comparative index performance. | |||||||||||||||||||||
| Performance Table Uses Highest Federal Rate | After‑tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. | |||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | After‑tax returns shown are not relevant to investors who hold their Fund shares through tax‑deferred arrangements, such as 401(k) plans or individual retirement accounts. | |||||||||||||||||||||
| Performance Table Explanation after Tax Higher | In some instances, the “Return after Taxes on Distributions and Sale of Fund Shares” may be greater than “Return before Taxes” because the investor is assumed to have a capital loss upon the sale of Fund shares to offset other taxable gains. | |||||||||||||||||||||
| Performance Availability Website Address [Text] | www.tweedyfunds.com | |||||||||||||||||||||
| Performance Availability Phone [Text] | 800‑432‑4789 | |||||||||||||||||||||
| TWEEDY BROWNE INTERNATIONAL VALUE FUND | ||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||
| Year to Date Return, Label [Optional Text] | year‑to‑date return | |||||||||||||||||||||
| Bar Chart, Year to Date Return | 16.40% | |||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Jun. 30, 2025 | |||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarterly Return | |||||||||||||||||||||
| Highest Quarterly Return | 14.46% | |||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | |||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarterly Return | |||||||||||||||||||||
| Lowest Quarterly Return | (21.37%) | |||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | |||||||||||||||||||||