Objective, Primary [Text Block]

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Risk/Return [Heading]

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Kinetics Small Cap Opportunities Fund

Objective [Heading]

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Investment Objective

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The investment objective of the Small Cap Opportunities Fund (the “Small Cap Fund”) is long-term growth of capital. The Small Cap Fund is the sole “feeder fund” to The Small Cap Opportunities Portfolio (the “Small Cap 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 Small Cap 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 Small Cap 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 Small Cap Portfolio’s, and therefore the Small Cap Fund’s, performance. During the most recent fiscal year, the Small Cap Portfolio’s portfolio turnover rate was 4% of the average value of its portfolio.

Portfolio Turnover, Rate

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4.00%

Expenses Represent Both Master and Feeder [Text]

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This table and the example below reflect the aggregate expenses of the Small Cap Fund and the Small Cap Opportunities Portfolio (the “Small Cap Portfolio”). The management fees paid by the Small Cap Fund reflect the proportionate share of fees allocated to the Small Cap Fund from the Small Cap Portfolio.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

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Total Annual Fund Operating Expenses do not correlate to the ratio of operating expenses to average net assets before expense reimbursement found in the “Financial Highlights” section of this Prospectus, which reflect the Small Cap Fund’s operating expenses and does not include acquired fund fees and expenses (“AFFE”).

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 Small Cap Fund with the cost of investing in other mutual funds. This Example assumes that you invest $10,000 in the Small Cap 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 Small Cap Fund’s operating expenses remain the same (taking into account the expense limitations only in 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 Small Cap Fund would be:

Strategy [Heading]

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Principal Investment Strategy

Strategy Narrative [Text Block]

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The Small Cap Fund is a non-diversified fund that invests all of its investable assets in the Small Cap Portfolio, a series of Kinetics Portfolios Trust. Under normal circumstances, the Small Cap 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 small capitalization companies that provide attractive valuation opportunities. The Small Cap Portfolio’s Investment Adviser considers small cap companies to be those with market capitalizations at or below the highest market capitalization of a component security within the S&P 600^® SmallCap Index. The highest market capitalization of a company within the S&P 600^® SmallCap Index was approximately $4.01 billion as of March 31, 2017. The Small Cap Portfolio may also invest in exchange-traded funds (“ETFs”) and purchase and write options for hedging purposes and/or direct investment.

The Small Cap 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 Small Cap Portfolio focuses on undervalued and special situation small capitalization equities that the Investment Adviser believes have the potential for rewarding long-term investment results. Small Cap Portfolio securities will generally be selected from companies that are engaged in a number of industries if, in the Investment Adviser’s opinion, they are selling below their perceived intrinsic value, have limited or no institutional ownership, have had short-term earnings shortfalls, have had a recent initial public offering (“IPO”) but have not attracted significant analyst coverage, are selling at or below book or replacement value, or have modest price to earnings ratios. The Investment Adviser 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. Additionally, the Small Cap 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 Small Cap Portfolio.

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 Small Cap Fund, and indirectly the Small Cap Portfolio, are listed below and could adversely affect the net asset value (“NAV”), total return and value of the Small Cap Fund, the Small Cap 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 Small Cap Portfolio, and therefore the Small Cap 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 Small Cap Portfolio’s, and therefore the Small Cap Fund’s, investment objective.

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

Small-Capitalization Company Risks: The Small Cap Portfolio primarily invests in the stocks of small-capitalization companies. Small-capitalization companies often have narrower markets and more limited managerial and financial resources than 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 Small Cap 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 Small Cap 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 Small Cap 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 Small Cap 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 Small Cap Portfolio’s shares, and therefore the Small Cap Fund’s shares, more than shares of a more diversified mutual fund that holds more investments.

Interest Rate Risk: The risk that when interest rates increase, fixed-income securities held by the Small Cap 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 Small Cap Portfolio. These leveraged instruments may result in losses to the Small Cap Portfolio or may adversely affect the Small Cap Portfolio’s NAV or total return, because instruments that contain leverage are more sensitive to changes in interest rates. The Small Cap 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 Small Cap 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 Small Cap 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.

Special Situations Risks: The Small Cap Portfolio may use aggressive investment techniques, including seeking to benefit from “special situations,” such as mergers, reorganizations, or other unusual events expected to affect a particular issuer. There is a risk that the “special situation” might not occur or involve longer time frames than originally expected, which could have a negative impact on the price of the issuer’s securities and fail to produce gains or produce a loss for the Small Cap Portfolio, and therefore the Small Cap Fund.

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

IPO Risk: IPO share prices can be volatile and fluctuate considerably due to factors such as the absence of a prior public market, unseasoned trading, a limited number of shares available for trading, and limited operating history and/or information about the issuer. The purchase of IPO shares may involve high transaction costs. IPO shares are subject to market risk and liquidity risk.

Who may want to invest?

The Small Cap 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 Small Cap 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 Small Cap Portfolio’s shares, and therefore the Small Cap Fund’s shares, more than shares of a more 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 bar chart and table shown below illustrate the variability of the Small Cap Fund’s returns. The bar chart indicates the risks of investing in the Small Cap Fund by showing the changes in the Small Cap Fund’s performance from year to year (on a calendar year basis). The table shows how the Small Cap Fund’s average annual returns, before and after taxes, compare with those of the S&P 600^® SmallCap Index, the Russell 2000^® Index and the S&P 500^® Index, which represent broad measures of market performance. The past performance of the Small Cap Fund, before and after taxes, is not necessarily an indication of how the Small Cap Fund or the Small Cap 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 Small Cap Fund by showing the changes in the Small Cap Fund’s performance from year to year (on a calendar year basis).

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 Small Cap Fund, before and after taxes, is not necessarily an indication of how the Small Cap Fund or the Small Cap Portfolio will perform in the future.

Bar Chart [Heading]

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The Small Cap Fund – Institutional Class Calendar Year Returns as of 12/31

Bar Chart Closing [Text Block]

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Best Quarter:	2009	Q2	41.92%
Worst Quarter:	2008	Q4	-29.91%

Highest Quarterly Return, Label

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Best Quarter:

Highest Quarterly Return, Date

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Jun. 30, 2009

Highest Quarterly Return

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41.92%

Lowest Quarterly Return, Label

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Worst Quarter:

Lowest Quarterly Return, Date

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Dec. 31, 2008

Lowest Quarterly Return

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(29.91%)

Performance Table Market Index Changed

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Effective April 30, 2017, the S&P 600 ® SmallCap Index will replace the Russell 2000 ® Index as a more appropriate comparative index for the Small Cap Opportunities Fund.

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 Small Cap 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. 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 Closing [Text Block]

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Effective April 30, 2017, the S&P 600 ^® SmallCap Index will replace the Russell 2000 ^® Index as a more appropriate comparative index for the Small Cap Opportunities Fund.

Caption

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Average Annual Total Returns as of 12/31/2016

Institutional Class Prospectus | Kinetics Small Cap Opportunities Fund | S&P 600® SmallCap Index (reflects no deductions for fees, expenses or taxes)

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S&P 600® SmallCap Index (reflects no deductions for fees, expenses or taxes)

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26.56%

rr_AverageAnnualReturnYear05

16.62%

rr_AverageAnnualReturnYear10

9.03%

rr_AverageAnnualReturnSinceInception

9.40%

Institutional Class Prospectus | Kinetics Small Cap Opportunities Fund | Russell 2000® Index (reflects no deductions for fees, expenses or taxes)

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Aug. 12, 2005

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Russell 2000® Index (reflects no deductions for fees, expenses or taxes)

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21.31%

rr_AverageAnnualReturnYear05

14.46%

rr_AverageAnnualReturnYear10

7.07%

rr_AverageAnnualReturnSinceInception

8.00%

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

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Aug. 12, 2005

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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%

rr_AverageAnnualReturnSinceInception

7.66%

Institutional Class Prospectus | Kinetics Small Cap Opportunities Fund | Institutional Class

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Aug. 12, 2005

Redemption Fee (as a percentage of Amount Redeemed)

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(2.00%)

Management Fees

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1.25%

^[1]

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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0.26%

Other Expenses

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0.46%

Acquired Fund Fees and Expenses

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0.02%

Total Annual Fund Operating Expenses

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1.73%

^[2]

Less: Fee Waiver

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(0.27%)

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Net Annual Fund Operating Expenses

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1.46%

Expense Example, with Redemption, 1 Year

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$ 149

Expense Example, with Redemption, 3 Years

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519

Expense Example, with Redemption, 5 Years

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913

Expense Example, with Redemption, 10 Years

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$ 2,019

Annual Return 2007

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19.91%

Annual Return 2008

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(57.82%)

Annual Return 2009

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58.45%

Annual Return 2010

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14.10%

Annual Return 2011

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(13.51%)

Annual Return 2012

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27.04%

Annual Return 2013

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59.72%

Annual Return 2014

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(7.12%)

Annual Return 2015

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(12.06%)

Annual Return 2016

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24.61%

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The Small Cap Fund (KSCYX) Institutional Return Before Taxes

rr_AverageAnnualReturnYear01

24.61%

rr_AverageAnnualReturnYear05

15.61%

rr_AverageAnnualReturnYear10

5.03%

rr_AverageAnnualReturnSinceInception

7.03%

Institutional Class Prospectus | Kinetics Small Cap Opportunities Fund | Institutional Class | After Taxes on Distributions

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Aug. 12, 2005

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The Small Cap Fund (KSCYX) Institutional Return After Taxes on Distributions

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24.61%

rr_AverageAnnualReturnYear05

15.61%

rr_AverageAnnualReturnYear10

4.89%

Institutional Class Prospectus | Kinetics Small Cap Opportunities Fund | Institutional Class | After Taxes on Distributions and Sale of Fund Shares

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6.89%

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The Small Cap Fund (KSCYX) Institutional Return After Taxes on Distributions and Sale of Fund Shares

rr_AverageAnnualReturnYear01

13.93%

rr_AverageAnnualReturnYear05

12.62%

rr_AverageAnnualReturnYear10

3.97%