v3.26.3
Fees and Expenses - BRUCE FUND
Oct. 26, 2026
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses of the Fund
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

 
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] The operating expenses in this fee table will not correlate to the expense ratio in the Fund’s financial highlights because the financial statements include only the direct operating expenses incurred by the Fund.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)		  
Management Fee 0.41%
Distribution (12b-1) Fees 0.00%
Other Expenses 0.15%
Acquired Fund Fees and Expenses(1) 0.01%
Total Annual Fund Operating Expenses 0.57%
   
1.Acquired Fund Fees and Expenses are the indirect costs of investing in other investment companies. The operating expenses in this fee table will not correlate to the expense ratio in the Fund’s financial highlights because the financial statements include only the direct operating expenses incurred by the Fund.

 
Expense Example [Heading] Expense Example:
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
  $58 $183 $318 $714
         
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the Expense Example above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 5% of the average value of its portfolio.
Portfolio Turnover, Rate 5.00%