Our investment objective is to seek to achieve high total returns through current income and capital appreciation, with an emphasis on principal protection. We invest primarily in the debt of middle-market companies as well as small businesses, including senior secured loans, junior loans, mezzanine debt and bonds. Such investments may include an equity component, and, to a lesser extent, we may make equity investments directly. Certain investment operations are conducted through the Company’s wholly-owned subsidiaries, Special Value Continuation Partners LLC, a Delaware limited liability company (“SVCP”), TCPC Funding I, LLC (“TCPC Funding”), TCPC Funding II, LLC ("TCPC Funding II") and TCPC SBIC, LP (the “SBIC”). SVCP was organized as a limited partnership and had elected to be regulated as a BDC under the 1940 Act through July 31, 2018. On August 1, 2018, SVCP withdrew its election to be regulated as a BDC under the 1940 Act and withdrew the registration of its common limited partner interests under Section 12(g) of the 1934 Act and, on August 2, 2018, terminated its general partner, Series H of SVOF/MM, LLC, and converted to a Delaware limited liability company. Series H of SVOF/MM, LLC (“SVOF/MM”) serves as the administrator (the “Administrator”) of the Company. The managing member of SVOF/MM is Tennenbaum Capital Partners, LLC (the “Advisor”), which serves as the investment manager to the Company, TCPC Funding, TCPC Funding II and the SBIC. On August 1, 2018, the Advisor merged with and into a wholly owned subsidiary of BlackRock Capital Investment Advisors, LLC, an indirect wholly owned subsidiary of BlackRock, Inc. with the Advisor as the surviving entity. The SBIC was organized as a Delaware limited partnership in June 2013. On April 22, 2014, the SBIC received a license from the United States Small Business Administration (the “SBA”) to operate as a small business investment company under the provisions of Section 301(c) of the Small Business Investment Act of 1958.

Risk Factors [Table Text Block]

Item 1A. Risk Factors

In addition to the other information set forth in this report, you should carefully consider the risk factor discussed below and the risk factors in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the “Annual Report”), which could materially affect our business, financial condition and/or operating results. The risks described in our Annual Report and discussed below are not the only risks facing us. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially and adversely affect our business, financial condition and/or operating results.

The U.S. and global capital markets are subject to systemic risk that could adversely affect our business, financial condition and results of operations.

Issuers, national and regional banks, financial institutions and other participants in the U.S. and global capital markets are closely interrelated as a result of credit, trading, clearing, technology and other relationships. A significant adverse development (such as a bank run, insolvency, bankruptcy or default) with one or more national or regional banks, financial institutions or other participants in the financial or capital markets may spread to others and lead to significant concentrated or market-wide problems (such as defaults, liquidity problems, impairment charges, additional bank runs and/or losses) for other participants in these markets. Future developments, including actions taken by the U.S. Department of Treasury, FDIC, Federal Reserve Board, and systemic risk in the U.S. and global banking sectors and broader economies in general, are difficult to assess and quantify, and the form and magnitude of such developments or other actions of the U.S. Department of Treasury, FDIC and Federal Reserve Board may remain unknown for significant periods of time and could have an adverse effect on the Company.

For example, in response to the rapidly declining financial condition of regional banks Silicon Valley Bank (“SVB”) and Signature Bank (“Signature”), the California Department of Financial Protection and Innovation (the “CDFPI”) and the New York State Department of Financial Services (the “NYSDFS”) closed SVB and Signature on March 10, 2023 and March 12, 2023, respectively, and the Federal Deposit Insurance Corporation (“FDIC”) was appointed as receiver for SVB and Signature. Although the U.S. Department of the Treasury, the Federal Reserve and the FDIC have taken measures to stabilize the financial system, uncertainty and liquidity concerns in the broader financial services industry remain. Additionally, should there be additional systemic pressure on the financial system and capital markets, we cannot assure you of the response of any government or regulator, and any response may not be as favorable to industry participants as the measures currently being pursued. In addition, highly publicized issues related to the U.S. and global capital markets in the past have led to significant and widespread investor concerns over the integrity of the capital markets. The current situation related to SVB and Signature could in the future lead to further rules and regulations for public companies, banks, financial institutions and other participants in the U.S. and global capital markets, and complying with the requirements of any such rules or regulations may be burdensome. Even if not adopted, evaluating and responding to any such proposed rules or regulations could results in increased costs and require significant attention from the Advisor.

Share Price [Table Text Block]

Price Range of Common Stock

Our common stock began trading on April 5, 2012 and is currently traded on The NASDAQ Global Select Market under the symbol “TCPC.” The following table lists the high and low closing sale price for our common stock, the closing sale price as a percentage of net asset value, or NAV, and quarterly distributions per share in each fiscal quarter for the first quarter of the year ends December 31,

2023, the year ended December 31, 2022 and the year ended December 31, 2021. On March 31, 2023, the reported closing price of our common stock was $10.30 per share.


							Premium/ (Discount)	Premium/ (Discount)
			Stock Price				of High Sales Price	of Low Sales Price
	NAV(1)		High(2)		Low(2)		to NAV (3)	to NAV (3)	Declared Distributions
Fiscal Year ended December 31, 2023
First Quarter	$	13.00	$	13.37	$	9.73	2.8%	(25.2)%	$	0.32
Fiscal Year ended December 31, 2022
First Quarter	$	14.27	$	14.30	$	13.10	0.2%	(8.2)%	$	0.30
Second Quarter	$	13.97	$	14.36	$	11.87	2.8%	(15.0)%	$	0.30
Third Quarter	$	14.12	$	14.28	$	10.92	1.1%	(22.7)%	$	0.30
Fourth Quarter	$	12.93	$	13.54	$	10.84	4.7%	(16.2)%	$	0.37
Fiscal Year ended December 31, 2021
First Quarter	$	13.56	$	14.89	$	11.13	9.8%	(17.9)%	$	0.30
Second Quarter	$	14.21	$	14.97	$	13.74	5.3%	(3.3)%	$	0.30
Third Quarter	$	14.09	$	14.39	$	13.36	2.1%	(5.2)%	$	0.30
Fourth Quarter	$	14.36	$	14.36	$	13.18	0.0%	(8.2)%	$	0.30

(1)

NAV per share is determined as of the last day in the relevant quarter and therefore may not reflect the NAV per share on the date of the high and low sales prices. The NAVs shown are based on outstanding shares at the end of each period.

(2)

The High/Low Stock Price is calculated as of the closing price on a given day in the applicable quarter.

(3)

Calculated as the respective High/Low Stock Price minus the quarter end NAV, divided by the quarter end NAV.

Lowest Price or Bid

$ 9.73

$ 10.84

$ 10.92

$ 11.87

$ 13.10

$ 13.18

$ 13.36

$ 13.74

$ 11.13

Highest Price or Bid

$ 13.37

$ 13.54

$ 14.28

$ 14.36

$ 14.30

$ 14.36

$ 14.39

$ 14.97

$ 14.89

Highest Price or Bid, Premium (Discount) to NAV [Percent]

2.80%

4.70%

1.10%

2.80%

0.20%

0.00%

2.10%

5.30%

9.80%

Lowest Price or Bid, Premium (Discount) to NAV [Percent]

(25.20%)

(16.20%)

(22.70%)

(15.00%)

(8.20%)

(5.20%)

(3.30%)

(17.90%)

Latest Share Price

$ 10.30

Latest NAV

$ 13.00

$ 12.93

$ 14.12

$ 13.97

$ 14.27

$ 14.36

$ 14.09

$ 14.21

$ 13.56

Market Disruptions And Other Geopolitical Or Macroeconomic Events

General Description of Registrant [Abstract]

Risk [Text Block]

The U.S. and global capital markets are subject to systemic risk that could adversely affect our business, financial condition and results of operations.