| Form N-CSR Cover | 12 Months Ended |
| Nov. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | THOMPSON IM FUNDS, INC. |
| Entity Central Index Key | 0000795264 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| Shareholder Report | 12 Months Ended |
| Nov. 30, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | THOMPSON IM FUNDS, INC. |
| Entity Central Index Key | 0000795264 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| Thompson LargeCap Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Thompson LargeCap Fund |
| Class Name | Thompson LargeCap Fund |
| Trading Symbol | THPGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Thompson LargeCap Fund for the period of December 1, 2023 to November 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at http://www.thompsonim.com/forms/index. html 1-800-999-0887 thompsonimfunds usbank.com |
| Additional Information Phone Number | 1-800-999-0887 |
| Additional Information Email | thompsonimfunds@usbank.com |
| Additional Information Website | http://www.thompsonim.com/forms/index. html |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Costs of a $10,000 Costs paid as a percentage of Fund Name investment a $10,000 investment Thompson LargeCap Fund $114 0.99% |
| Expenses Paid, Amount | $ 114 |
| Expense Ratio, Percent | 0.99% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS P ERFORMANCE? For the fiscal year ended November 30, 2024, the Fund returned 31.13%, as compared to its benchmark, the S&P 500 Index, which returned 33.89%. The S&P 500 has performed well, but the returns have been driven by a small group of companies nicknamed “the Magnificent 7” (Alphabet, Amazon, Apple, Meta Platforms, Microsoft, Nvidia, and Tesla). Due to valuation concerns the Fund chose to underweight these stocks relative to the benchmark. This difference was the primary explanation for the Fund’s relative performance during the fiscal year. Top contributors to performance: Financials were the best performing sector during the fiscal year for the Fund, as both an overweight plus positive issue selection added to performance. Industrials and Real Estate were also among the top contributors to performance. Top detractors to performance: The underweight in Magnificent 7 stocks led to underperformance in Information Technology and Communication Services. Weakness in Walgreens also detracted from performance within Consumer Staples. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a good predictor of how the fund will perform in the future. |
| Line Graph [Table Text Block] | FUND PERFORMANCE |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL RETURNS 1 Year 5 Years 10 Years Thompson LargeCap Fund 31.13% 14.02% 10.88% S&P 500 Index 33.89% 15.77% 13.35% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 190,258,018 |
| Holdings Count | Holding | 77 |
| Advisory Fees Paid, Amount | $ 1,625,418 |
| Investment Company, Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Net Assets $ 190,258,018 Number of Holdings 77 Portfolio Turnover 21% Total Advisory Fees Paid $ 1,625,418 |
| Holdings [Text Block] | Sector Weightings (%) Information Technology 22.9% Financials 19.4% Health Care 19.0% Communication Services 13.2% Consumer Discretionary 6.5% Consumer Staples 5.9% Industrials 4.2% Energy 3.7% Materials 2.5% Cash & Other 2.7% |
| Largest Holdings [Text Block] | Top Holdings (%) Alphabet Inc. Class A 4.3% Microsoft Corp. 4.1% Warner Bros. Discovery, Inc. 3.0% Apple Inc. 2.9% Exact Sciences Corp. 2.4% PayPal Holdings, Inc. 2.3% Citigroup Inc. 2.2% Meta Platforms, Inc. Class A 2.2% Visa Inc. Class A 2.2% The Charles Schwab Corp. 2.2% |
| Updated Prospectus Phone Number | 1-800-999-0887 |
| Updated Prospectus Email Address | thompsonimfunds@usbank.com |
| Updated Prospectus Web Address | http://www.thompsonim.com/forms/index.html |
| Thompson MidCap Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Thompson MidCap Fund |
| Class Name | Thompson MidCap Fund |
| Trading Symbol | THPMX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Thompson MidCap Fund for the period of December 1, 2023 to November 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at http://www.thompsonim.com/forms/index. html 1-800-999-0887 thompsonimfunds usbank.com |
| Additional Information Phone Number | 1-800-999-0887 |
| Additional Information Email | thompsonimfunds@usbank.com |
| Additional Information Website | http://www.thompsonim.com/forms/index. html |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Costs of a $10,000 Costs paid as a percentage of Fund Name investment a $10,000 investment Thompson MidCap Fund $130 1.15% |
| Expenses Paid, Amount | $ 130 |
| Expense Ratio, Percent | 1.15% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS P ERFORMANCE? For the fiscal year ended November 30, 2024, the Fund returned 26.47%, compared to 33.89% for the Fund’s broad-based market index, the S&P 500 Index. The Russell Midcap Index, which is a securities market index with investment characteristics similar to those of the Fund, returned 33.66% over the same period. Equity returns during the fiscal year were correlated with market capitalization size, with Large Cap stocks outperforming Mid Cap stocks, which in turn outperformed Small Cap stocks. Some of this was driven by strength in a small group of companies nicknamed “the Magnificent 7” (Alphabet, Amazon, Apple, Meta Platforms, Microsoft, Nvidia, and Tesla). The Fund’s underperformance was largely driven by a higher exposure to smaller stocks, as over 40% of holdings had a market capitalization of around $10 billion or less. This compares to roughly 20% of the Russell Midcap index and even less of the S&P 500 index. Top contributors to performance: Financials were the top performing sector for the Fund, followed by Information Technology. Performance was broad based in each sector, with numerous individual holdings acting as top contributors. Top detractors to performance: Healthcare was the Fund’s biggest laggard, due to both an overweight of a sector with poor performance, and individual holdings such as AMN Healthcare and Acadia Healthcare. Consumer Discretionary and Communication Services holdings were also among the larger detractors to performance. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a good predictor of how the fund will perform in the future. |
| Line Graph [Table Text Block] | FUND PERFORMANCE |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL RETURNS 1 Year 5 Years 10 Years Thompson MidCap Fund 26.47% 11.23% 8.11% S&P 500 Index 33.89% 15.77% 13.35% Russell Midcap Index 33.66% 12.05% 10.45% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 59,171,497 |
| Holdings Count | Holding | 83 |
| Advisory Fees Paid, Amount | $ 542,614 |
| Investment Company, Portfolio Turnover | 27% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Net Assets $ 59,171,497 Number of Holdings 83 Portfolio Turnover 27 Total Advisory Fees Paid $ 542,614 |
| Holdings [Text Block] | Sector Weightings (%) Financials 20.9 Industrials 14.5 Health Care 13.7 Information Technology 12.6 Consumer Discretionary 9.6 Communication Services 6.7 Real Estate 6.3 Materials 4.6 Consumer Staples 3.9 Cash & Other 7.2 |
| Largest Holdings [Text Block] | Top Holdings (%) Warner Bros. Discovery, Inc. 2.9 Exact Sciences Corp. 2.4 Viatris Inc. 2.2 The Charles Schwab Corp. 2.2 Marvell Technology, Inc. 2.1 Performance Food Group Co. 2.1 Neurocrine Biosciences, Inc. 2.1 O-I Glass, Inc. 2.1 Take-Two Interactive Software, Inc. 2.1 Concentrix Corp. 2.0 |
| Updated Prospectus Phone Number | 1-800-999-0887 |
| Updated Prospectus Email Address | thompsonimfunds@usbank.com |
| Updated Prospectus Web Address | http://www.thompsonim.com/forms/index.html |
| Thompson Bond Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Thompson Bond Fund |
| Class Name | Thompson Bond Fund |
| Trading Symbol | THOPX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Thompson Bond Fund for the period of December 1, 2023 to November 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at http://www.thompsonim.com/forms/index. html 1-800-999-0887 thompsonimfunds usbank.com |
| Additional Information Phone Number | 1-800-999-0887 |
| Additional Information Email | thompsonimfunds@usbank.com |
| Additional Information Website | http://www.thompsonim.com/forms/index. html |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Costs of a $10,000 Costs paid as a percentage of Fund Name investment a $10,000 investment Thompson Bond Fund $ 79 0.74 |
| Expenses Paid, Amount | $ 79 |
| Expense Ratio, Percent | 0.74% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the fiscal year ended November 30, 2024, the Fund returned 14.11%, compared to 6.88% for the Fund’s broad-based market index, the Bloomberg US Aggregate Bond Index. The Bloomberg U.S. Government/Credit 1-5 Year Index, which is a securities market index with investment characteristics similar to those of the Fund, returned 5.56% over the same period. The Fund outperformed due to its overweight in corporate bonds, asset backed securities (ABS) and Commercial Mortgage Backed Securities (CMBS) against an underweight in Treasury bonds. Corporate bonds and ABS were particularly strong as both benefited from a narrowing of spreads during the fiscal year. A higher current yield also contributed to performance. At period end, corporates made up about 64% of Fund assets, up from roughly 58% a year ago and notably overweight versus the broad-based index of 25%. Exposure to U.S. Treasuries stood at 6% as of November 30, 2024, compared with 44% for the index. Top contributors to performance: Corporate bonds and ABS bonds were the biggest contributors. Within corporate bonds, fixed to float hybrid bonds were significant contributors, although most holdings benefited from a narrowing of spreads. Within ABS bonds, bonds backed by aircraft performed the strongest. Top detractors to performance: There were no significant detractors from performance, as even the Fund’s Treasury holdings performed in line with their benchmark equivalents. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a good predictor of how the fund will perform in the future. |
| Line Graph [Table Text Block] | FUND PERFORMANCE |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL RETURNS 1 Year 5 Years 10 Years Thompson Bond Fund 14.11% 2.89% 3.19% Bloomberg U.S. Aggregate Index 6.88% -0.01% 1.52% Bloomberg U.S. Gov’t./Credit 1-5 Year Index 5.56% 1.36% 1.64% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 1,602,419,200 |
| Holdings Count | Holding | 407 |
| Advisory Fees Paid, Amount | $ 8,041,459 |
| Investment Company, Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Net Assets $ 1,602,419,200 Number of Holdings 407 Portfolio Turnover 21 Average Credit Quality+ BBB Effective Duration 2.00 yrs Total Advisory Fees Paid $ 8,041,459 |
| Holdings [Text Block] | Asset Allocation (%) Corporate Bonds 63.5 Commercial Mortgage- Backed Securities 12.7 Asset-Backed Securities 12.0 U.S. Government & Agency Securities 7.4 U.S. Government Agency Mortgage-Backed Securities 2.3 Net Other Assets & Liabilities 2.1 Credit Rating Description + (%) AAA AAA Rating [Member] 0.2 AA AA Rating [Member] 9.9 A A Rating [Member] 11.7 BBB BBB Rating [Member] 59.7 BB and Below BB and Below Rating [Member] 15.2 Not Rated 1.2 Other Net Assets and Liabilities 2.1 + Ratings provided by Standard & Poor’s, Moody’s, and Fitch. When ratings are available from multiple rating agencies, a conservative methodology is to be adopted: For cases where there are three distinct ratings available, use the middle- quality rating (dropping the highest and lowest ratings); if two different ratings are available, use the lower rating; if only one agency rates a holding, then use that rating. For certain securities that are not rated by any of these three agencies, credit ratings from other agencies may be used. For cases where there is not a rating available from any agency, the holding is classified as Not Rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). |
| Credit Quality Explanation [Text Block] | Ratings provided by Standard & Poor’s, Moody’s, and Fitch. When ratings are available from multiple rating agencies, a conservative methodology is to be adopted: For cases where there are three distinct ratings available, use the middle- quality rating (dropping the highest and lowest ratings); if two different ratings are available, use the lower rating; if only one agency rates a holding, then use that rating. For certain securities that are not rated by any of these three agencies, credit ratings from other agencies may be used. For cases where there is not a rating available from any agency, the holding is classified as Not Rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). |
| Largest Holdings [Text Block] | Top 10 Issuers (%) U.S. Treasury Bills 5.9 Lincoln National Corp. 2.8 JPMBB Commercial Mortgage Securities Trust 1.7 Labrador Aviation Finance Ltd. 1.7 Morgan Stanley Bank of America Merrill Lynch Trust 1.5 Wells Fargo Commercial Mortgage Trust 1.5 Coinstar Funding, LLC 1.5 COMM Mortgage Trust 1.4 Ginnie Mae REMIC Trust 1.4 WFRBS Commercial Mortgage Trust 1.3 |
| Updated Prospectus Phone Number | 1-800-999-0887 |
| Updated Prospectus Email Address | thompsonimfunds@usbank.com |
| Updated Prospectus Web Address | http://www.thompsonim.com/forms/index.html |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 72 Months Ended | 84 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | |
| Nov. 30, 2014 | Nov. 30, 2015 | Nov. 30, 2016 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2022 | Nov. 30, 2023 | Nov. 30, 2024 | |
| Thompson LargeCap Fund | |||||||||||
| Account Value [Line Items] | |||||||||||
| Accumulated Value | $ 10,000 | $ 9,548.09 | $ 10,900.39 | $ 12,570.23 | $ 12,786.97 | $ 14,568.79 | $ 16,766.02 | $ 21,244.29 | $ 19,941.62 | $ 21,413.50 | $ 28,079.52 |
| Thompson MidCap Fund | |||||||||||
| Account Value [Line Items] | |||||||||||
| Accumulated Value | 10,000 | 9,489.83 | 10,800.87 | 12,397.70 | 11,672.37 | 12,814.21 | 14,167.47 | 18,382.19 | 17,331.81 | 17,250.51 | 21,816.57 |
| Thompson Bond Fund | |||||||||||
| Account Value [Line Items] | |||||||||||
| Accumulated Value | 10,000 | 9,795.69 | 10,486.71 | 11,070.63 | 11,333.47 | 11,866.51 | 11,558.56 | 12,416.99 | 11,526.73 | 11,990.59 | 13,682.58 |
| S&P 500 Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Accumulated Value | 10,000 | 10,274.92 | 11,102.04 | 13,642.73 | 14,498.05 | 16,835.65 | 19,772.43 | 25,292.46 | 22,964.16 | 26,142.94 | 35,003.23 |
| Russell Midcap Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Accumulated Value | 10,000 | 10,045.84 | 11,000.33 | 13,064.49 | 13,310.72 | 15,301.95 | 17,510.57 | 21,589.64 | 19,641.59 | 20,219.33 | 27,026.54 |
| Bloomberg U.S. Aggregate Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Accumulated Value | 10,000 | 10,097.07 | 10,316.29 | 10,647.90 | 10,504.97 | 11,638.56 | 12,486.27 | 12,342.18 | 10,757.37 | 10,884.24 | 11,632.59 |
| Bloomberg U.S. Govt./Credit 1-5 Year Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Accumulated Value | $ 10,000 | $ 10,084.07 | $ 10,213.84 | $ 10,346.16 | $ 10,383.82 | $ 10,994.77 | $ 11,517.38 | $ 11,441.85 | $ 10,790.47 | $ 11,142.05 | $ 11,761.87 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 120 Months Ended |
| Nov. 30, 2024 | Nov. 30, 2024 | Nov. 30, 2024 | |
| Thompson LargeCap Fund | Thompson LargeCap Fund [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Thompson LargeCap Fund | ||
| Average Annual Return, Percent | 31.13% | 14.02% | 10.88% |
| Thompson MidCap Fund | Thompson MidCap Fund [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Thompson MidCap Fund | ||
| Average Annual Return, Percent | 26.47% | 11.23% | 8.11% |
| Thompson Bond Fund | Thompson Bond Fund [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Thompson Bond Fund | ||
| Average Annual Return, Percent | 14.11% | 2.89% | 3.19% |
| S&P 500 Index [Member] | Thompson LargeCap Fund [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P 500 Index | ||
| Average Annual Return, Percent | 33.89% | 15.77% | 13.35% |
| S&P 500 Index [Member] | Thompson MidCap Fund [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P 500 Index | ||
| Average Annual Return, Percent | 33.89% | 15.77% | 13.35% |
| Russell Midcap Index [Member] | Thompson MidCap Fund [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell Midcap Index | ||
| Average Annual Return, Percent | 33.66% | 12.05% | 10.45% |
| Bloomberg U.S. Aggregate Index [Member] | Thompson Bond Fund [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Index | ||
| Average Annual Return, Percent | 6.88% | (0.01%) | 1.52% |
| Bloomberg U.S. Govt./Credit 1-5 Year Index [Member] | Thompson Bond Fund [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. Gov’t./Credit 1-5 Year Index | ||
| Average Annual Return, Percent | 5.56% | 1.36% | 1.64% |
| Shareholder Report, Holdings (Details) | Nov. 30, 2024 | |
| Thompson LargeCap Fund | Alphabet Inc. Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.30% | |
| Thompson LargeCap Fund | Microsoft Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.10% | |
| Thompson LargeCap Fund | Warner Bros. Discovery, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3% | |
| Thompson LargeCap Fund | Apple Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.90% | |
| Thompson LargeCap Fund | Exact Sciences Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | |
| Thompson LargeCap Fund | PayPal Holdings, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.30% | |
| Thompson LargeCap Fund | Citigroup Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| Thompson LargeCap Fund | Meta Platforms, Inc. Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| Thompson LargeCap Fund | Visa Inc. Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| Thompson LargeCap Fund | The Charles Schwab Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| Thompson LargeCap Fund | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 22.90% | |
| Thompson LargeCap Fund | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 19.40% | |
| Thompson LargeCap Fund | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 19% | |
| Thompson LargeCap Fund | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.20% | |
| Thompson LargeCap Fund | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.50% | |
| Thompson LargeCap Fund | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.90% | |
| Thompson LargeCap Fund | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.20% | |
| Thompson LargeCap Fund | Energy Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.70% | |
| Thompson LargeCap Fund | Materials Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.50% | |
| Thompson LargeCap Fund | Cash & Other [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.70% | |
| Thompson MidCap Fund | Warner Bros. Discovery, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.90% | |
| Thompson MidCap Fund | Exact Sciences Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | |
| Thompson MidCap Fund | The Charles Schwab Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| Thompson MidCap Fund | Viatris Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | |
| Thompson MidCap Fund | Marvell Technology, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| Thompson MidCap Fund | Performance Food Group Co. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| Thompson MidCap Fund | Neurocrine Biosciences, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| Thompson MidCap Fund | O-I Glass, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| Thompson MidCap Fund | Take-Two Interactive Software, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| Thompson MidCap Fund | Concentrix Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2% | |
| Thompson MidCap Fund | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 12.60% | |
| Thompson MidCap Fund | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 20.90% | |
| Thompson MidCap Fund | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.70% | |
| Thompson MidCap Fund | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.70% | |
| Thompson MidCap Fund | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 9.60% | |
| Thompson MidCap Fund | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | |
| Thompson MidCap Fund | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 14.50% | |
| Thompson MidCap Fund | Materials Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.60% | |
| Thompson MidCap Fund | Cash & Other [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.20% | |
| Thompson MidCap Fund | Real Estate [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.30% | |
| Thompson Bond Fund | U.S. Treasury Bills [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.90% | |
| Thompson Bond Fund | Lincoln National Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.80% | |
| Thompson Bond Fund | JPMBB Commercial Mortgage Securities Trust [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | |
| Thompson Bond Fund | Labrador Aviation Finance Ltd. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | |
| Thompson Bond Fund | Morgan Stanley Bank of America Merrill Lynch Trust [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.50% | |
| Thompson Bond Fund | Wells Fargo Commercial Mortgage Trust [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.50% | |
| Thompson Bond Fund | Coinstar Funding, LLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.50% | |
| Thompson Bond Fund | COMM Mortgage Trust [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.40% | |
| Thompson Bond Fund | Ginnie Mae REMIC Trust [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.40% | |
| Thompson Bond Fund | WFRBS Commercial Mortgage Trust [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.30% | |
| Thompson Bond Fund | AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.20% | [1] |
| Thompson Bond Fund | AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 9.90% | [1] |
| Thompson Bond Fund | A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 11.70% | [1] |
| Thompson Bond Fund | BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 59.70% | [1] |
| Thompson Bond Fund | BB and Below Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.20% | [1] |
| Thompson Bond Fund | Not Rated [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | [1] |
| Thompson Bond Fund | Other Net Assets and Liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | [1] |
| Thompson Bond Fund | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 63.50% | |
| Thompson Bond Fund | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 12% | |
| Thompson Bond Fund | Commercial Mortgage-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 12.70% | |
| Thompson Bond Fund | US Government Corporations and Agencies Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.40% | |
| Thompson Bond Fund | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.30% | |
| Thompson Bond Fund | Net Other Assets & Liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | |
| [1] Ratings provided by Standard & Poor’s, Moody’s, and Fitch. When ratings are available from multiple rating agencies, a conservative methodology is to be adopted: For cases where there are three distinct ratings available, use the middle- quality rating (dropping the highest and lowest ratings); if two different ratings are available, use the lower rating; if only one agency rates a holding, then use that rating. For certain securities that are not rated by any of these three agencies, credit ratings from other agencies may be used. For cases where there is not a rating available from any agency, the holding is classified as Not Rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). | ||
