Objective, Primary [Text Block]

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Risk/Return [Heading]

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Kinetics Medical Fund

Objective [Heading]

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Investment Objective

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The investment objective of the Medical Fund is long-term growth of capital. The Medical Fund is the sole “feeder fund” to The Medical Portfolio, a series of Kinetics Portfolios Trust.

Expense [Heading]

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

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This table describes the fees and expenses you may pay if you buy and hold shares of the Medical Fund.

Shareholder Fees Caption [Text]

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SHAREHOLDER FEES (fees paid directly from your investment)

Operating Expenses Caption [Text]

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ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

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May 01, 2018

Portfolio Turnover [Heading]

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Portfolio Turnover.

Portfolio Turnover [Text Block]

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The Medical Portfolio 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 fund operating expenses or in the Example, affect the Medical Portfolio’s, and therefore the Medical Fund’s, performance. During the most recent fiscal year, the Medical Portfolio’s portfolio turnover rate was 0% of the average value of its portfolio.

Portfolio Turnover, Rate

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none

Expenses Represent Both Master and Feeder [Text]

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This table and the example below reflect the aggregate expenses of the Medical Fund and the Medical Portfolio. The management fees paid by the Medical Fund reflect the proportionate share of fees allocated to the Medical Fund from the Medical Portfolio.

Other Expenses, New Fund, Based on Estimates [Text]

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“Other Expenses” are estimated for the current fiscal year since Institutional Class Shares of the Medical Fund have not commenced operations as of the date of this Prospectus.

Expense Example [Heading]

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Example.

Expense Example Narrative [Text Block]

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This Example is intended to help you compare the cost of investing in the Medical Fund with the cost of investing in other mutual funds. This Example assumes that you invest $10,000 in the Medical Fund for the time periods indicated and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Medical Fund’s operating expenses remain the same (taking into account the expense limitations only the first year).

Expense Example by, Year, Caption [Text]

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Although your actual costs may be higher or lower, based on these assumptions your cost for the Medical Fund would be:

Strategy [Heading]

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Principal Investment Strategy

Strategy Narrative [Text Block]

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The Medical Fund is a non-diversified fund that invests all of its investable assets in the Medical Portfolio, a series of Kinetics Portfolios Trust. Under normal circumstances, the Medical Portfolio invests at least 80% of its net assets plus any borrowings for investment purposes in common stocks, convertible securities, warrants and other equity securities having the characteristics of common stocks (such as American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and International Depositary Receipts (“IDRs”)) of U.S. and foreign companies engaged in medical research, pharmaceutical and medical technology industries and related technology industries, generally, with an emphasis toward companies engaged in cancer research and drug development, such as pharmaceutical development companies, surgical and medical instrument manufacturers and developers, pharmaceutical manufacturers, and biotech and medical research companies. These types of companies derive at least 50% of their revenue from such activities. The Medical Portfolio may also invest in exchange-traded funds (“ETFs”) and purchase and write options for hedging purposes and/or direct investment.

The Medical Portfolio may invest up to 20% of its total assets in convertible and non-convertible debt securities rated below investment grade, also known as junk bonds, or unrated securities that the Investment Adviser has determined to be of comparable quality.

The Investment Adviser selects portfolio securities by evaluating a company’s positioning and the resources that it currently expends on research and development, looking for a significant percentage, or large amount, of capital invested into research and treatment of cancer and other diseases. The Investment Adviser also considers a company’s fundamentals by reviewing its balance sheets, corporate revenues, earnings and dividends. The Investment Adviser also looks at the amount of capital a company spends on research and development because the Investment Adviser believes that such expenditures frequently have significant bearing on future growth. The Medical Portfolio may invest in companies of any size, including small and medium-size companies. Additionally, the Medical Portfolio may participate in securities lending arrangements up to 33-1/3% of the securities in its portfolio with brokers, dealers, and financial institutions (but not individuals) in order to increase the return on its portfolio.

Sell decisions are generally triggered by either adequate value being achieved, as determined by the Investment Adviser, or by an adverse change in a company’s operating performance or a deterioration of the company’s business model. A sell trigger may also occur if the Investment Adviser discovers a new investment opportunity that it believes is more compelling and represents a greater risk reward profile than other investment(s) held by the Medical Portfolio.

Strategy Portfolio Concentration [Text]

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Risk [Heading]

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Principal Investment Risks

Risk Narrative [Text Block]

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Investing in common stocks has inherent risks that could cause you to lose money. The principal risks of investing in the Medical Fund, and indirectly the Medical Portfolio, are listed below and could adversely affect the net asset value (“NAV”), total return and value of the Medical Fund, the Medical Portfolio and your investment.

»	Stock Market Risks: Stock mutual funds are subject to stock market risks and significant fluctuations in value. If the stock market declines in value, the Medical Portfolio, and therefore the Medical Fund, is likely to decline in value and you could lose money on your investment.

»	Stock Selection Risks: The portfolio securities selected by the Investment Adviser may decline in value or not increase in value when the stock market in general is rising and may fail to meet the Medical Portfolio’s, and therefore the Medical Fund’s, investment objective.

»	Liquidity Risks: The Investment Adviser may not be able to sell portfolio securities at an optimal time or price.

Industry Emphasis Risks: Mutual funds that invest a substantial portion of their assets in a particular industry carry a risk that a group of industry-related securities will decline in price due to industry-specific developments. Companies in the same or similar industries may share common characteristics and are more likely to react comparably to industry-specific market or economic developments.

Concentration Risks of the Medical Industry: Medical and pharmaceutical-related companies in general are subject to the rate of change in technology, which is generally higher than that of other industries. Similarly, cancer research-related industries use many products and services of companies engaged in medical and pharmaceutical-related activities and are also subject to relatively high risks of rapid obsolescence caused by progressive scientific and technological advances. Additionally, it is possible that a medical device or product may fail after its research period; such research period may involve substantial research, testing and development time and the development company may incur significant costs. Further, the medical research and development industry is subject to strict regulatory scrutiny and ongoing legislative action.

Small and Medium-Size Company Risks: The Medical Portfolio may invest in the equity securities of small and medium-size companies. Small and medium-size companies often have narrower markets and more limited managerial and financial resources than do larger, more established companies. As a result, their performance can be more volatile and they face a greater risk of business failure, which could increase the volatility of the Medical Portfolio’s assets.

Exchange-Traded Funds (ETFs) Risks: ETFs are registered investment companies whose shares are listed and traded on U.S. stock exchanges or otherwise traded in the over-the-counter market. In general, passively-managed ETFs seek to track a specified securities index or a basket of securities that an “index provider,” such as Standard & Poor’s, selects as representative of a market, market segment or industry sector. A passively-managed ETF is designed so that its performance will correspond closely with that of the index it tracks. A leveraged ETF will engage in transactions and purchase instruments that give rise to forms of leverage, including, among others, the use of reverse repurchase agreements and other borrowings, the investment of collateral from loans of portfolio securities, the use of when issued, delayed-delivery or forward commitment transactions or short sales. To the extent a fund invests in ETFs that achieve leveraged exposure to their underlying indexes through the use of derivative instruments, the fund will indirectly be subject to leveraging risk. As a shareholder in an ETF, the Medical Portfolio will bear its pro rata portion of an ETF’s expenses, including advisory fees, in addition to its own expenses.

Foreign Securities Risks: The Medical Portfolio may invest in foreign securities directly or through ADRs, GDRs and IDRs. Foreign securities can carry higher returns but involve more risks than those associated with U.S. investments. Additional risks associated with investment in foreign securities include currency fluctuations, political and economic instability, differences in financial reporting standards and less stringent regulation of securities markets.

Non-Diversification Risks: As a non-diversified investment company, the Medical Portfolio can invest a large percentage of its assets in a small number of issuers. As a result, a change in the value of any one investment may affect the overall value of the Medical Portfolio’s shares, and therefore the Medical Fund’s shares, more than shares of a diversified mutual fund that holds more investments.

Interest Rate Risk: The risk that when interest rates increase, fixed-income securities held by the Medical Portfolio will decline in value. Long-term fixed-income securities will normally have more price volatility because of this risk than short-term fixed-income securities. It is likely there will be less governmental action in the near future to maintain low interest rates. The negative impact on fixed income securities from the resulting rate increases for that and other reasons could be swift and significant.

Leveraging Risks: Investments in derivative instruments may give rise to a form of leverage. The Investment Adviser may engage in speculative transactions, which involve substantial risk and leverage. The use of leverage by the Investment Adviser may increase the volatility of the Medical Portfolio. These leveraged instruments may result in losses to the Medical Portfolio or may adversely affect the Medical Portfolio’s NAV or total return, because instruments that contain leverage are more sensitive to changes in interest rates. The Medical Portfolio may also have to sell assets at inopportune times to satisfy its obligations in connection with such transactions.

Option Transaction Risks: Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks. The successful use of options depends in part on the ability of the Investment Adviser to manage future price fluctuations and the degree of correlation between the options and securities markets. By writing put options on equity securities, the Medical Portfolio gives up the opportunity to benefit from potential increases in the value of the common stocks above the strike prices of the written put options, but continues to bear the risk of declines in the value of its common stock portfolio. The Medical Portfolio will receive a premium from writing a covered call option that it retains whether or not the option is exercised. The premium received from the written options may not be sufficient to offset any losses sustained from the volatility of the underlying equity securities over time.

»	Below Investment Grade Debt Securities Risks: Generally, below investment grade debt securities, i.e., junk bonds, are subject to greater credit risk, price volatility and risk of loss than investment grade securities. Junk bonds are considered to be speculative in nature.

»	Convertible Securities Risks: Convertible securities are subject to the risks affecting both equity and fixed income securities, including market, credit, liquidity and interest rate risk.

»	Management Risks: There is no guarantee that the Medical Fund will meet its investment objective. The Investment Adviser does not guarantee the performance of the Medical Fund, nor can it assure you that the market value of your investment will not decline.

Who may want to invest?

The Medical Fund may be appropriate for investors who:

»	wish to invest for the long-term;

»	want to diversify their portfolios;

»	want to allocate some portion of their long-term investments to value equity investing;

»	are willing to accept the volatility associated with equity investing; and

»	are comfortable with the risks described herein.

Risk Lose Money [Text]

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Investing in common stocks has inherent risks that could cause you to lose money.

Risk Nondiversified Status [Text]

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As a non-diversified investment company, the Medical Portfolio can invest a large percentage of its assets in a small number of issuers. As a result, a change in the value of any one investment may affect the overall value of the Medical Portfolio’s shares, and therefore the Medical Fund’s shares, more than shares of a diversified mutual fund that holds more investments.

Bar Chart and Performance Table [Heading]

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Performance

Performance Narrative [Text Block]

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The Institutional Class shares of the Medical Fund had not commenced operations as of December 31, 2016. The performance information shown below is for another class of shares (No Load Class) of the Fund that is not offered in this Prospectus but would have substantially similar annual returns because each Class of shares will be invested in the same portfolio of securities. Annual returns will differ only to the extent that the Classes do not have the same expenses.

The bar chart and table shown below illustrate the variability of the returns for the Medical Fund’s No Load Class. The bar chart indicates the risks of investing in the Medical Fund by showing the changes in the Medical Fund’s performance from year to year (on a calendar year basis). The table shows how the Medical Fund’s average annual returns, before and after taxes, compare with those of the S&P 500^® Index and the NASDAQ Composite^® Index, which represent broad measures of market performance. The past performance of the Medical Fund, before and after taxes, is not necessarily an indication of how the Medical Fund or the Medical Portfolio will perform in the future. Updated performance information is available on the Fund’s website at http://www.kineticsfunds.com/ or by calling the Fund toll-free at (800) 930-3828.

Performance Information Illustrates Variability of Returns [Text]

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The bar chart indicates the risks of investing in the Medical Fund by showing the changes in the Medical Fund’s performance from year to year (on a calendar year basis).

Performance One Year or Less [Text]

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The Institutional Class shares of the Medical Fund had not commenced operations as of December 31, 2016.

Performance Availability Phone [Text]

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(800) 930-3828

Performance Availability Website Address [Text]

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http://www.kineticsfunds.com

Performance Past Does Not Indicate Future [Text]

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The past performance of the Medical Fund, before and after taxes, is not necessarily an indication of how the Medical Fund or the Medical Portfolio will perform in the future.

Bar Chart [Heading]

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The Medical Fund – No Load Class Calendar Year Returns as of 12/31

Bar Chart Closing [Text Block]

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Best Quarter:	2013	Q1	20.54%
Worst Quarter:	2011	Q3	-15.60%

Bar Chart, Returns for Class Not Offered in Prospectus [Text]

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The performance information shown below is for another class of shares (No Load Class) of the Fund that is not offered in this Prospectus but would have substantially similar annual returns because each Class of shares will be invested in the same portfolio of securities.

Highest Quarterly Return, Label

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Best Quarter:

Highest Quarterly Return, Date

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Mar. 31, 2013

Highest Quarterly Return

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20.54%

Lowest Quarterly Return, Label

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Worst Quarter:

Lowest Quarterly Return, Date

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Sep. 30, 2011

Lowest Quarterly Return

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(15.60%)

Index No Deduction for Fees, Expenses, Taxes [Text]

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(reflects no deductions for fees, expenses or taxes)

Performance Table Uses Highest Federal Rate

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Performance Table Not Relevant to Tax Deferred

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Your actual after-tax returns depend on your tax situation and may differ from those shown. If you own Fund shares in a tax-deferred account, such as a 401(k) plan or an individual retirement account (“IRA”), the information on after-tax returns is not relevant to your investment.

Performance Table Explanation after Tax Higher

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The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon the redemption of Fund shares.

Performance Table Narrative

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The Medical Fund’s after-tax returns as shown in the following table are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns depend on your tax situation and may differ from those shown. If you own Fund shares in a tax-deferred account, such as a 401(k) plan or an individual retirement account (“IRA”), the information on after-tax returns is not relevant to your investment. After-tax returns are shown for the No Load Class shares only. After-tax returns for the Institutional Class shares will differ. The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon the redemption of Fund shares.

Caption

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Average Annual Total Returns as of 12/31/2016

Institutional Class Prospectus | Kinetics Medical Fund | S&P 500® Index (reflects no deductions for fees, expenses or taxes)

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S&P 500® Index (reflects no deductions for fees, expenses or taxes)

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11.96%

rr_AverageAnnualReturnYear05

14.66%

rr_AverageAnnualReturnYear10

6.95%

Average Annual Returns, Inception Date

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5.29%

^[1]

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Sep. 30, 1999

Institutional Class Prospectus | Kinetics Medical Fund | NASDAQ Composite® Index (reflects no deductions for fees, expenses or taxes)

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NASDAQ Composite® Index (reflects no deductions for fees, expenses or taxes)

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7.50%

rr_AverageAnnualReturnYear05

15.62%

rr_AverageAnnualReturnYear10

8.34%

Average Annual Returns, Inception Date

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3.98%

^[1]

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Sep. 30, 1999

Institutional Class Prospectus | Kinetics Medical Fund | Institutional Class

Redemption Fee (as a percentage of Amount Redeemed)

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(2.00%)

Management Fees

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1.25%

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Distribution (Rule 12b-1) Fees

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none

Shareholder Servicing Fees

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0.20%

Other Operating Expenses

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0.58%

Other Expenses

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0.78%

^[3]

Total Annual Fund Operating Expenses

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2.03%

Less: Fee Waiver

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(0.84%)

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Net Annual Fund Operating Expenses

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1.19%

Expense Example, with Redemption, 1 Year

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$ 121

Expense Example, with Redemption, 3 Years

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555

Expense Example, with Redemption, 5 Years

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1,016

Expense Example, with Redemption, 10 Years

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$ 2,291

Institutional Class Prospectus | Kinetics Medical Fund | No Load Class

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Annual Return 2007

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15.47%

Annual Return 2008

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(20.42%)

Annual Return 2009

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24.47%

Annual Return 2010

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4.30%

Annual Return 2011

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5.11%

Annual Return 2012

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8.86%

Annual Return 2013

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49.25%

Annual Return 2014

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16.44%

Annual Return 2015

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6.59%

Annual Return 2016

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(8.01%)

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The Medical Fund (MEDRX) No Load Return Before Taxes

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(8.01%)

rr_AverageAnnualReturnYear05

13.15%

rr_AverageAnnualReturnYear10

8.81%

Average Annual Returns, Inception Date

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9.08%

^[1]

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Sep. 30, 1999

Institutional Class Prospectus | Kinetics Medical Fund | No Load Class | After Taxes on Distributions

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The Medical Fund (MEDRX) No Load Return After Taxes on Distributions

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(9.23%)

rr_AverageAnnualReturnYear05

11.94%

rr_AverageAnnualReturnYear10

7.94%

Institutional Class Prospectus | Kinetics Medical Fund | No Load Class | After Taxes on Distributions and Sale of Fund Shares

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8.50%

^[1]

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The Medical Fund (MEDRX) No Load Return After Taxes on Distributions and Sale of Fund Shares

rr_AverageAnnualReturnYear01

(3.56%)

rr_AverageAnnualReturnYear05

10.50%

rr_AverageAnnualReturnYear10

7.17%