S000026835 [Member] Performance Management - TWEEDY, BROWNE INTERNATIONAL VALUE FUND II - CURRENCY UNHEDGED |
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 a relevant market benchmark. This information may help illustrate the risks of investing in the Fund. Absent any applicable agreements to waive and/or reimburse certain of the Fund’s operational expenses, the returns of the Fund would have been lower. 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 a relevant market benchmark. | |||||||||||||||||||||
| Bar Chart [Heading] | International Value Fund II – Currency Unhedged 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 be lower had certain fees and expenses not been waived and/or reimbursed during certain periods.
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| 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 someinstances, 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 II - CURRENCY UNHEDGED | ||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||
| Year to Date Return, Label [Optional Text] | year‑to‑date return | |||||||||||||||||||||
| Bar Chart, Year to Date Return | 21.53% | |||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Jun. 30, 2025 | |||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarterly Return | |||||||||||||||||||||
| Highest Quarterly Return | 17.87% | |||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | |||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarterly Return | |||||||||||||||||||||
| Lowest Quarterly Return | (25.51%) | |||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | |||||||||||||||||||||