| N-2 - shares | | 12 Months Ended |
| Dec. 31, 2022 | Dec. 31, 2022 |
| Cover [Abstract] | | |
| Entity Central Index Key | | 0000825202 |
| Amendment Flag | | true |
| Amendment Description | | The Registrant is filing this amendment to its Form N-CSR for the period ended December 31, 2022, originally filed with the Securities and Exchange Commission on March 4, 2022 (Accession Number 0001193125-22-065958). The purpose of this amendment is to (i) provide or revise certain required performance tables; (ii) add required disclosure regarding past performance results; (iii) provide the results of certain past Fund shareholders' meetings; (iv) add Section 19(a) distribution information; and (v) update the time periods in Item 11 (Controls and Procedures) and certifications (Items 13(a)(2) and 13(b)). Except as set forth above (and the dates included on the signature page and the certifications required by Rule 30a-2(a) and Rule 30a-2(b)), this amendment does not amend, update or change any other items or disclosures found in the original Form N-CSR filing. |
| Document Type | | N-CSR/A |
| Entity Registrant Name | | SPROTT FOCUS TRUST, INC. |
| General Description of Registrant [Abstract] | | |
| Investment Objectives and Practices [Text Block] | | Investment Objectives and Policies The Fund’s primary investment goal is long-term capital growth. The Fund normally invests at least 65% of its assets in equity securities. The Sub-Adviser uses a value approach to invest the Fund’s assets in a limited number of domestic and foreign companies. While the Fund is not restricted as to stock market capitalization, the Sub-Adviser focuses the Fund’s investments primarily in small-cap companies (companies with stock market capitalizations between $500 million and $2.5 billion) and micro-cap companies (companies with stock market capitalizations below $500 million) with significant business activities in the United States. Stock market capitalization is calculated by multiplying the total number of common shares issued and outstanding by the per share market price of the common stock. The Fund may invest up to 35% of its assets in direct obligations of the U.S. Government or its agencies and in the non-convertible preferred stocks and debt securities of domestic and foreign companies. The Sub-Adviser invests the Fund’s assets primarily in a limited number of companies selected using a value approach. While it does not limit the stock market capitalizations of the companies in which the Fund may invest, the Sub-Adviser has historically focused on small-cap and micro-cap equity securities. The Sub-Adviser uses a value method in managing the Fund’s assets. In selecting equity securities for the Fund, the Sub-Adviser evaluates the quality of a company’s balance sheet, the level of its cash flows and various measures of a company’s profitability. The Sub-Adviser then uses these factors to assess the company’s current worth, basing this assessment on either what it believes a knowledgeable buyer might pay to acquire the entire company or what it thinks the value of the company should be in the stock market. This analysis takes a number of factors into consideration, including the company’s future growth prospects and current financial condition. The Sub-Adviser invests in the equity securities of companies that are trading significantly below its estimate of the company’s “current worth” in an attempt to reduce the risk of overpaying for such companies. The Sub-Adviser’s value approach strives to reduce some of the other risks of investing in small-cap companies (for the Fund’s portfolio taken as a whole) by evaluating various other risk factors. The Sub-Adviser attempts to lessen financial risk by buying companies with strong balance sheets. While no assurance can be given that this risk-averse value approach will be successful, the Sub-Adviser believes that it can reduce some of the risks of investing in the securities of small-cap companies, which are inherently fragile in nature and whose securities have substantially greater market price volatility. Although the Sub-Adviser’s approach to security selection seeks to reduce downside risk to the Fund’s portfolio, especially during periods of broad small-cap market declines, it may also potentially have the effect of limiting gains in strong small-cap up markets. |
| Risk Factors [Table Text Block] | | Principal Risks Equity Securities Risk. Fixed Income Securities. Two of the main risks of investing in fixed income securities are credit risk and interest rate risk. Below investment-grade debt securities are primarily speculative and may entail substantial risk of loss of principal and non-payment of interest, but may also produce above-average returns for the Fund. Debt securities rated C or D may be in default as to the payment of interest or repayment of principal. As of the date of the financial statements, interest rates are near historical lows, which makes it more likely that they will increase in the future, which could, in turn, result in a decline in the market value of the fixed income securities held by the Fund. Foreign Investments. Foreign investments involve certain risks which typically are not present in securities of domestic issuers. There may be less information available about a foreign company than a domestic company; foreign companies may not be subject to accounting, auditing and reporting standards and requirements comparable to those applicable to domestic companies; and foreign markets, brokers and issuers are generally subject to less extensive government regulation than their domestic counterparts. Foreign securities may be less liquid and may be subject to greater price volatility than domestic securities. Foreign investments also may be subject to local economic and political risks which might adversely affect the Fund’s ability to realize on its investment in such securities. No assurance can be given that the Sub-Adviser will be able to anticipate these potential events or counter their effects. The Fund does not expect to purchase or sell foreign currencies to hedge against declines in the U.S. dollar or to lock in the value of the foreign securities it purchases, and its foreign investments may be adversely affected by changes in foreign currency rates. Consequently, the risks associated with such investments may be greater than if the Fund did engage in foreign currency transactions for hedging purposes. Income earned or received Limited Number of Portfolio Holdings. Sector Risk. Securities Lending. Share Price Discount. Small/Mid-Cap Companies. nd ecuritie Warrants, Rights or Options. |
| Equity Securities Risk [Member] | | |
| General Description of Registrant [Abstract] | | |
| Risk [Text Block] | | Equity Securities Risk. |
| Fixed Income Securities [Member] | | |
| General Description of Registrant [Abstract] | | |
| Risk [Text Block] | | Fixed Income Securities. Two of the main risks of investing in fixed income securities are credit risk and interest rate risk. Below investment-grade debt securities are primarily speculative and may entail substantial risk of loss of principal and non-payment of interest, but may also produce above-average returns for the Fund. Debt securities rated C or D may be in default as to the payment of interest or repayment of principal. As of the date of the financial statements, interest rates are near historical lows, which makes it more likely that they will increase in the future, which could, in turn, result in a decline in the market value of the fixed income securities held by the Fund. |
| Foreign Investments [Member] | | |
| General Description of Registrant [Abstract] | | |
| Risk [Text Block] | | Foreign Investments. Foreign investments involve certain risks which typically are not present in securities of domestic issuers. There may be less information available about a foreign company than a domestic company; foreign companies may not be subject to accounting, auditing and reporting standards and requirements comparable to those applicable to domestic companies; and foreign markets, brokers and issuers are generally subject to less extensive government regulation than their domestic counterparts. Foreign securities may be less liquid and may be subject to greater price volatility than domestic securities. Foreign investments also may be subject to local economic and political risks which might adversely affect the Fund’s ability to realize on its investment in such securities. No assurance can be given that the Sub-Adviser will be able to anticipate these potential events or counter their effects. The Fund does not expect to purchase or sell foreign currencies to hedge against declines in the U.S. dollar or to lock in the value of the foreign securities it purchases, and its foreign investments may be adversely affected by changes in foreign currency rates. Consequently, the risks associated with such investments may be greater than if the Fund did engage in foreign currency transactions for hedging purposes. Income earned or received |
| Limited Number of Portfolio Holdings [Member] | | |
| General Description of Registrant [Abstract] | | |
| Risk [Text Block] | | Limited Number of Portfolio Holdings. |
| Sector Risk [Member] | | |
| General Description of Registrant [Abstract] | | |
| Risk [Text Block] | | Sector Risk. |
| Securities Lending [Member] | | |
| General Description of Registrant [Abstract] | | |
| Risk [Text Block] | | Securities Lending. |
| Share Price Discount [Member] | | |
| General Description of Registrant [Abstract] | | |
| Risk [Text Block] | | Share Price Discount. |
| Small/Mid-Cap Companies [Member] | | |
| General Description of Registrant [Abstract] | | |
| Risk [Text Block] | | Small/Mid-Cap Companies. nd ecuritie |
| Warrants, Rights or Options [Member] | | |
| General Description of Registrant [Abstract] | | |
| Risk [Text Block] | | Warrants, Rights or Options. |
| Common Shares [Member] | | |
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | | |
| Outstanding Security, Authorized [Shares] | 150,000,000 | |
| Outstanding Security, Held [Shares] | 29,940,765 | |
