SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
Restricted Stock Subject Only To A Service Condition Policy [Text Block]	Restricted Stock Subject Only to a Service Condition We calculate compensation cost for restricted stock grants by using the fair market value of our common stock at the date of grant, the number of shares issued and an adjustment for restrictions on dividends. This compensation cost is amortized on a straight-line basis over the applicable vesting period, with adjustments for forfeitures recorded as they occur.
Restricted Stock Subject To Service And Performance Conditions Policy [Text Block]	Restricted Stock Subject to Service and Performance Conditions Under the Plan, certain key employees were provided agreements for grants of restricted shares that vest over multiple year periods subject to achieving annual performance goals established by the Compensation Committee of Westwood’s Board of Directors. Each year the Compensation Committee establishes specific goals for that year’s vesting of the restricted shares. The date that the Compensation Committee establishes annual goals is considered to be the grant date and the fair value measurement date to determine expense on the shares that are likely to vest. The vesting period ends when the Compensation Committee formally approves the performance-based restricted stock vesting based on the specific performance goals from the Company’s audited consolidated financial statements. If a portion of the performance-based restricted shares does not vest, no compensation expense is recognized for that portion and any previously recognized compensation expense related to shares that do not vest is reversed.
Revenue [Policy Text Block]	Revenue Recognition Revenues are recognized when the performance obligation (the investment management and advisory or trust services provided to the client) defined by the investment advisory or sub-advisory agreement is satisfied. For each performance obligation, we determine at contract inception whether the revenue satisfies over time or at a point in time. We derive our revenues from investment advisory fees, trust fees and other sources of revenues. Advisory and trust fees are calculated based on a percentage of AUM and the performance obligation is realized over the current calendar quarter. Once clients receive our investment advisory services we have an enforceable right to payment. Advisory Fee Revenues Our advisory fees are generated by Westwood Management and Westwood International Advisors, which manage client accounts under investment advisory and sub-advisory agreements. Advisory fees are typically calculated based on a percentage of AUM and are paid in accordance with the terms of the agreements. Advisory fees are paid quarterly in advance based on AUM on the last day of the preceding quarter, quarterly in arrears based on AUM on the last day of the quarter just ended or are based on a daily or monthly analysis of AUM for the stated period. We recognize advisory fee revenues as services are rendered. Since our advance paying clients' billing periods coincide with the calendar quarter to which such payments relate, revenue is recognized within the quarter and our Condensed Consolidated Financial Statements contain no deferred advisory fee revenues. Advisory clients typically consist of institutional and mutual fund accounts. Institutional investors include separate accounts of (i) corporate pension and profit sharing plans, public employee retirement funds, Taft-Hartley plans, endowments, foundations and individuals; (ii) subadvisory relationships where Westwood provides investment management services for funds offered by other financial institutions; (iii) pooled investment vehicles, including the UCITS Fund and collective investment trusts; and (iv) managed account relationships with brokerage firms and other registered investment advisors that offer Westwood products to their customers. Mutual funds include the Westwood Funds®, a family of mutual funds for which Westwood Management serves as advisor. These funds are available to individual investors, as well as offered as part of our investment strategies for institutional investors and wealth management accounts. Arrangements with Performance Based Obligations A limited number of our advisory clients have a contractual performance-based fee component in their contracts, which generates additional revenues if we outperform a specified index over a specific period of time, and a limited number of our mutual fund offerings have fees that generate additional revenues if we outperform specified indices over specific periods of time. The revenue is based on future market performance and is subject to factors outside our control. We cannot conclude that a significant reversal in the cumulative amount of revenue recognized will not occur during the measurement period, and therefore the revenue is recorded at the end of the measurement period when the performance obligation has been satisfied. Trust Fee Revenues Our trust fees are generated by Westwood Trust pursuant to trust or custodial agreements. Trust fees are separately negotiated with each client and are generally based on a percentage of AUM. Westwood Trust also provides trust services to a small number of clients on a fixed fee basis. The fees for most of our trust clients are calculated quarterly in arrears, based on a daily average of AUM for the quarter, or monthly, based on the month-end value of AUM. Since billing periods for most of Westwood Trust’s clients coincide with the calendar quarter, revenue is fully recognized within the quarter and our Condensed Consolidated Financial Statements contain no deferred advisory fee revenues.
Basis of Presentation	Basis of Presentation The accompanying Condensed Consolidated Financial Statements are unaudited and are presented in accordance with the requirements for quarterly reports on Form 10-Q and consequently do not include all of the information and footnote disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). The Company’s Condensed Consolidated Financial Statements reflect all adjustments (consisting only of normal recurring adjustments) necessary in the opinion of management to present fairly our interim financial position and results of operations and cash flows for the periods presented. The accompanying Condensed Consolidated Financial Statements are presented in accordance with GAAP and the rules and regulations of the SEC. The accompanying unaudited Condensed Consolidated Financial Statements should be read in conjunction with our Consolidated Financial Statements, and notes thereto, included in our Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC. Operating results for the periods in these Condensed Consolidated Financial Statements are not necessarily indicative of results for any future period. The accompanying Condensed Consolidated Financial Statements include the accounts of Westwood and its subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurement. The purpose of this amendment is to modify, remove and add certain disclosure requirements for fair value measurements. Under ASU 2018-13, entities are required to disclose the amount of total gains or losses recognized in other comprehensive income attributable to assets and liabilities categorized within Level 3 of the fair value hierarchy. The ASU includes an incremental requirement about significant unobservable inputs for Level 3 fair value measurements. The requirement to disclose reasons for transfers between Level 1 and Level 2 was removed. Various requirements for Level 3 disclosure were also modified. The amendments in this ASU are effective for all entities for fiscal years and interim periods beginning after December 15, 2019. We adopted this ASU as of January 1, 2020, and further information is included in Note 5 "Fair Value." There was no significant impact on our Condensed Consolidated Financial Statements. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Topic 350): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The purpose of this amendment is to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The amendments in this update are effective for public companies for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year. We adopted this ASU as of January 1, 2020 under the prospective transition method. Incremental costs related to hosting arrangements will be recorded on the Condensed Consolidated Balance Sheets in either other current or other long-term assets, instead of intangible assets, net. Related amortization will be recorded in information technology expense on the Condensed Consolidated Statements of Comprehensive Income (Loss), amortization of previously capitalized costs were recorded in general and administrative expense. In May 2019, the FASB issued ASU 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief. The purpose of this amendment is to amend ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, to allow companies to irrevocably elect, upon adoption of ASU 2016-13, the fair value option on financial instruments that were previously recorded at amortized cost and are within the scope of ASC 326-20, Financial Instruments-Credit Losses: Amortization Cost, if the instruments are eligible for the fair value option under Accounting Standards Codification 825 - Financial Instruments. The fair value option election does not apply to held-to-maturity debt securities. The amendments in this update are effective for public companies for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year. We adopted this ASU as of January 1, 2020, and it did not have a significant impact on our Condensed Consolidated Financial Statements.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2020

Restricted Stock Subject Only To A Service Condition Policy [Text Block]

Restricted Stock Subject Only to a Service Condition

We calculate compensation cost for restricted stock grants by using the fair market value of our common stock at the date of grant, the number of shares issued and an adjustment for restrictions on dividends. This compensation cost is amortized on a straight-line basis over the applicable vesting period, with adjustments for forfeitures recorded as they occur.

Restricted Stock Subject To Service And Performance Conditions Policy [Text Block]

Restricted Stock Subject to Service and Performance Conditions

Under the Plan, certain key employees were provided agreements for grants of restricted shares that vest over multiple year periods subject to achieving annual performance goals established by the Compensation Committee of Westwood’s Board of Directors. Each year the Compensation Committee establishes specific goals for that year’s vesting of the restricted shares. The date that the Compensation Committee establishes annual goals is considered to be the grant date and the fair value measurement date to determine expense on the shares that are likely to vest. The vesting period ends when the Compensation Committee formally approves the performance-based restricted stock vesting based on the specific performance goals from the Company’s audited consolidated financial statements. If a portion of the performance-based restricted shares does not vest, no compensation expense is recognized for that portion and any previously recognized compensation expense related to shares that do not vest is reversed.

Revenue [Policy Text Block]

Revenue Recognition

Revenues are recognized when the performance obligation (the investment management and advisory or trust services provided to the client) defined by the investment advisory or sub-advisory agreement is satisfied. For each performance obligation, we determine at contract inception whether the revenue satisfies over time or at a point in time. We derive our revenues from investment advisory fees, trust fees and other sources of revenues. Advisory and trust fees are calculated based on a percentage of AUM and the performance obligation is realized over the current calendar quarter. Once clients receive our investment advisory services we have an enforceable right to payment.

Advisory Fee Revenues

Our advisory fees are generated by Westwood Management and Westwood International Advisors, which manage client accounts under investment advisory and sub-advisory agreements. Advisory fees are typically calculated based on a percentage of AUM and are paid in accordance with the terms of the agreements. Advisory fees are paid quarterly in advance based on AUM on the last day of the preceding quarter, quarterly in arrears based on AUM on the last day of the quarter just ended or are based on a daily or monthly analysis of AUM for the stated period. We recognize advisory fee revenues as services are rendered. Since our advance paying clients' billing periods coincide with the calendar quarter to which such payments relate, revenue is recognized within the quarter and our Condensed Consolidated Financial Statements contain no deferred advisory fee revenues. Advisory clients typically consist of institutional and mutual fund accounts.

Institutional investors include separate accounts of (i) corporate pension and profit sharing plans, public employee retirement funds, Taft-Hartley plans, endowments, foundations and individuals; (ii) subadvisory relationships where Westwood provides investment management services for funds offered by other financial institutions; (iii) pooled investment vehicles, including the UCITS Fund and collective investment trusts; and (iv) managed account relationships with brokerage firms and other registered investment advisors that offer Westwood products to their customers.

Mutual funds include the Westwood Funds®, a family of mutual funds for which Westwood Management serves as advisor. These funds are available to individual investors, as well as offered as part of our investment strategies for institutional investors and wealth management accounts.

Arrangements with Performance Based Obligations

A limited number of our advisory clients have a contractual performance-based fee component in their contracts, which generates additional revenues if we outperform a specified index over a specific period of time, and a limited number of our mutual fund offerings have fees that generate additional revenues if we outperform specified indices over specific periods of time.

The revenue is based on future market performance and is subject to factors outside our control. We cannot conclude that a significant reversal in the cumulative amount of revenue recognized will not occur during the measurement period, and therefore the revenue is recorded at the end of the measurement period when the performance obligation has been satisfied.

Trust Fee Revenues

Our trust fees are generated by Westwood Trust pursuant to trust or custodial agreements. Trust fees are separately negotiated with each client and are generally based on a percentage of AUM. Westwood Trust also provides trust services to a small number of clients on a fixed fee basis. The fees for most of our trust clients are calculated quarterly in arrears, based on a daily average of AUM for the quarter, or monthly, based on the month-end value of AUM. Since billing periods for most of Westwood Trust’s clients coincide with the calendar quarter, revenue is fully recognized within the quarter and our Condensed Consolidated Financial Statements contain no deferred advisory fee revenues.

Basis of Presentation

The accompanying Condensed Consolidated Financial Statements are unaudited and are presented in accordance with the requirements for quarterly reports on Form 10-Q and consequently do not include all of the information and footnote disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). The Company’s Condensed Consolidated Financial Statements reflect all adjustments (consisting only of normal recurring adjustments) necessary in the opinion of management to present fairly our interim financial position and results of operations and cash flows for the periods presented. The accompanying Condensed Consolidated Financial Statements are presented in accordance with GAAP and the rules and regulations of the SEC.

The accompanying unaudited Condensed Consolidated Financial Statements should be read in conjunction with our Consolidated Financial Statements, and notes thereto, included in our Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC. Operating results for the periods in these Condensed Consolidated Financial Statements are not necessarily indicative of results for any future period. The accompanying Condensed Consolidated Financial Statements include the accounts of Westwood and its subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation.

Recent Accounting Pronouncements

Recently Adopted

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurement. The purpose of this amendment is to modify, remove and add certain disclosure requirements for fair value measurements. Under ASU 2018-13, entities are required to disclose the amount of total gains or losses recognized in other comprehensive income attributable to assets and liabilities categorized within Level 3 of the fair value hierarchy. The ASU includes an incremental requirement about significant unobservable inputs for Level 3 fair value measurements. The requirement to disclose reasons for transfers between Level 1 and Level 2 was removed. Various requirements for Level 3 disclosure were also modified. The amendments in this ASU are effective for all entities for fiscal years and interim periods beginning after December 15, 2019. We adopted this ASU as of January 1, 2020, and further information is included in Note 5 "Fair Value." There was no significant impact on our Condensed Consolidated Financial Statements.

In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Topic 350): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The purpose of this amendment is to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop

or obtain internal-use software (and hosting arrangements that include an internal-use software license). The amendments in this update are effective for public companies for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year. We adopted this ASU as of January 1, 2020 under the prospective transition method. Incremental costs related to hosting arrangements will be recorded on the Condensed Consolidated Balance Sheets in either other current or other long-term assets, instead of intangible assets, net. Related amortization will be recorded in information technology expense on the Condensed Consolidated Statements of Comprehensive Income (Loss), amortization of previously capitalized costs were recorded in general and administrative expense.

In May 2019, the FASB issued ASU 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief. The purpose of this amendment is to amend ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, to allow companies to irrevocably elect, upon adoption of ASU 2016-13, the fair value option on financial instruments that were previously recorded at amortized cost and are within the scope of ASC 326-20, Financial Instruments-Credit Losses: Amortization Cost, if the instruments are eligible for the fair value option under Accounting Standards Codification 825 - Financial Instruments. The fair value option election does not apply to held-to-maturity debt securities. The amendments in this update are effective for public companies for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year. We adopted this ASU as of January 1, 2020, and it did not have a significant impact on our Condensed Consolidated Financial Statements.