This annual shareholder report contains important information about Value Line Capital Appreciation Fund, Inc. (the "Fund") for the period of January 1, 2025 to December 31, 2025.

Additional Information [Text Block]

You can find additional information about the Fund at www.vlfunds.com. You can also request this information by contacting us at 1-800-243-2729 or investorservices@vlfunds.com.

Additional Information Phone Number

1-800-243-2729

Additional Information Email

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 14.4px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">investorservices@vlfunds.com</span>

Additional Information Website

Expenses [Text Block]

What were the Fund costs for last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Institutional Class	$92	0.83%

Expenses Paid, Amount

$ 92

Expense Ratio, Percent

0.83%

Factors Affecting Performance [Text Block]

How did the Fund perform last year?

The Fund's Institutional Class generated a total return of 21.07% during the 12 months ended December 31, 2025.

• The Fund outperformed its blended benchmark. Asset Allocation, i.e., being overweight equities and underweight fixed income, helped. The Fund’s equity portfolio outperformed the S&P 500^® Index, due to stock selection, sector allocation decisions and growth stocks’ strong performance. The Fund’s fixed income portfolio modestly outperformed the Bloomberg Index.

• The Fund’s equity portfolio was boosted most by stock selection in financials, health care and information technology and by an overweight to information technology. The only sector that detracted was energy, wherein stock selection was weak.

• Stocks contributing most positively were Micron Technology and Advanced Micro Devices, each a semiconductor company, and Robinhood Markets, a financial services platform operator. Micron Technology benefited from AI-driven demand for its memory chips. Advanced Micro Devices gained on its AI partnerships and demand for its AI accelerators. Robinhood Markets rose on product diversification, market expansion and inclusion in the S&P 500^® Index in September 2025

• Detracting most were out-of-Index positions in Strategy and Coinbase Global and an overweight in Chipotle Mexican Grill. Strategy, an enterprise analytics software provider that invests in Bitcoin, was hurt by Bitcoin’s price volatility and investor concerns about financing Bitcoin purchases. Coinbase Global, a crypto exchange and technology company, was affected by broader crypto market declines. Chipotle Mexican Grill, a fast-casual restaurant chain operator, saw increasing costs, margin pressures and weaker traffic trends. We sold the Fund’s position in Chipotle Mexican Grill.

• The fixed income portion of the Fund was helped most by sector allocation decisions. Overweights in corporate bonds, particularly BBB-rated bonds, and an underweight to U.S. Treasuries contributed most positively. Yield curve positioning also added value. An underweight to securitized debt and duration positioning modestly detracted.

Performance Past Does Not Indicate Future [Text]

<p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 9.33333px; font-weight: 400; grid-area: auto; line-height: 11.2px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">The performance data quoted represent past performance and are no guarantee of future performance. The investment return and principal value of an investment will fluctuate so that an investment, when redeemed, may be worth more or less than its original cost. The performance data includes reinvestments of all dividends and distributions but does not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.</p>

Line Graph [Table Text Block]

	Value Line Capital Appreciation Fund Inc.-Institutional Class	S&P 500^® Index	60/40 S&P 500^® Index/Bloomberg US Aggregate Bond Index
12/15	$10,000	$10,000	$10,000
01/16	$9,364	$9,504	$9,757
02/16	$9,364	$9,491	$9,777
03/16	$9,803	$10,135	$10,211
04/16	$9,837	$10,174	$10,250
05/16	$10,011	$10,357	$10,362
06/16	$9,858	$10,384	$10,452
07/16	$10,344	$10,766	$10,710
08/16	$10,541	$10,782	$10,714
09/16	$10,520	$10,784	$10,713
10/16	$10,265	$10,587	$10,563
11/16	$10,231	$10,979	$10,698
12/16	$10,306	$11,196	$10,831
01/17	$10,710	$11,408	$10,962
02/17	$11,076	$11,861	$11,253
03/17	$11,210	$11,875	$11,258
04/17	$11,491	$11,997	$11,363
05/17	$11,442	$12,166	$11,494
06/17	$11,801	$12,242	$11,532
07/17	$12,205	$12,494	$11,694
08/17	$12,438	$12,532	$11,757
09/17	$12,524	$12,790	$11,881
10/17	$12,511	$13,089	$12,050
11/17	$12,671	$13,490	$12,265
12/17	$12,812	$13,640	$12,370
01/18	$13,666	$14,421	$12,738
02/18	$13,342	$13,890	$12,408
03/18	$13,150	$13,537	$12,250
04/18	$13,293	$13,589	$12,242
05/18	$13,681	$13,916	$12,454
06/18	$13,911	$14,002	$12,494
07/18	$13,976	$14,523	$12,774
08/18	$14,455	$14,996	$13,056
09/18	$14,650	$15,081	$13,067
10/18	$13,172	$14,050	$12,490
11/18	$13,522	$14,337	$12,673
12/18	$12,478	$13,042	$12,079
01/19	$14,035	$14,087	$12,711
02/19	$14,302	$14,540	$12,953
03/19	$14,625	$14,822	$13,204
04/19	$15,032	$15,422	$13,526
05/19	$14,106	$14,442	$13,106
06/19	$15,130	$15,460	$13,726
07/19	$15,060	$15,682	$13,857
08/19	$14,527	$15,434	$13,869
09/19	$14,162	$15,723	$13,995
10/19	$14,344	$16,063	$14,194
11/19	$15,383	$16,646	$14,500
12/19	$15,785	$17,149	$14,758
01/20	$15,816	$17,142	$14,869
02/20	$15,183	$15,731	$14,241
03/20	$13,221	$13,788	$13,152
04/20	$15,507	$15,555	$14,257
05/20	$16,774	$16,296	$14,691
06/20	$17,407	$16,620	$14,904
07/20	$18,025	$17,558	$15,497
08/20	$19,029	$18,820	$16,115
09/20	$18,534	$18,105	$15,744
10/20	$18,241	$17,623	$15,465
11/20	$19,986	$19,552	$16,541
12/20	$21,061	$20,304	$16,932
01/21	$21,241	$20,099	$16,781
02/21	$21,780	$20,653	$16,962
03/21	$21,600	$21,558	$17,323
04/21	$22,335	$22,708	$17,932
05/21	$22,074	$22,867	$18,031
06/21	$22,906	$23,401	$18,334
07/21	$22,792	$23,956	$18,677
08/21	$23,347	$24,685	$19,004
09/21	$22,514	$23,537	$18,408
10/21	$23,445	$25,186	$19,179
11/21	$22,302	$25,011	$19,122
12/21	$22,562	$26,132	$19,617
01/22	$21,251	$24,780	$18,839
02/22	$20,450	$24,038	$18,416
03/22	$20,632	$24,931	$18,622
04/22	$18,137	$22,757	$17,365
05/22	$17,828	$22,798	$17,429
06/22	$16,061	$20,916	$16,456
07/22	$17,391	$22,845	$17,528
08/22	$17,209	$21,913	$16,901
09/22	$15,642	$19,895	$15,675
10/22	$16,480	$21,506	$16,355
11/22	$17,117	$22,708	$17,144
12/22	$15,853	$21,399	$16,520
01/23	$18,011	$22,744	$17,346
02/23	$17,548	$22,189	$16,913
03/23	$18,112	$23,004	$17,457
04/23	$18,032	$23,363	$17,663
05/23	$18,435	$23,464	$17,632
06/23	$19,282	$25,015	$18,306
07/23	$20,170	$25,818	$18,654
08/23	$19,665	$25,407	$18,428
09/23	$18,838	$24,196	$17,714
10/23	$18,112	$23,687	$17,378
11/23	$20,008	$25,850	$18,645
12/23	$21,387	$27,025	$19,439
01/24	$21,346	$27,479	$19,614
02/24	$22,630	$28,946	$20,131
03/24	$23,526	$29,878	$20,594
04/24	$22,080	$28,657	$19,882
05/24	$22,854	$30,078	$20,608
06/24	$23,648	$31,157	$21,130
07/24	$23,465	$31,537	$21,481
08/24	$23,831	$32,302	$21,917
09/24	$24,544	$32,992	$22,316
10/24	$24,748	$32,692	$21,973
11/24	$26,642	$34,611	$22,840
12/24	$25,987	$33,786	$22,363
01/25	$26,892	$34,727	$22,785
02/25	$26,275	$34,274	$22,807
03/25	$24,752	$32,343	$22,039
04/25	$25,328	$32,124	$21,984
05/25	$27,077	$34,146	$22,751
06/25	$28,888	$35,882	$23,586
07/25	$29,196	$36,687	$23,878
08/25	$29,608	$37,431	$24,283
09/25	$31,151	$38,797	$24,921
10/25	$32,097	$39,706	$25,333
11/25	$31,645	$39,803	$25,433
12/25	$31,462	$39,827	$25,428

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Institutional Class	21.07%	8.36%	12.14%
S&P 500^® Index	17.88%	14.42%	14.82%
60/40 S&P 500^® Index/Bloomberg US Aggregate Bond Index	13.70%	8.47%	9.78%

AssetsNet

$ 532,512,147

Holdings Count | Holding

212

Advisory Fees Paid, Amount

$ 3,143,973

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$532,512,147
# of Portfolio Holdings	212
Portfolio Turnover Rate	43%
Total Advisory Fees Paid	$3,143,973

Holdings [Text Block]

Asset Allocation (% of Net Assets)

Value	Value
Common Stocks	65.1%
Bonds & Notes	29.1%
Cash & Other Assets - Net	5.8%

Common Stock Sectors (% of Common Stocks)*

Information Technology	41.0%
Communication Services	16.6%
Financials	13.3%
Consumer Discretionary	13.1%
Healthcare	9.6%
Industrials	5.4%
Energy	1.0%

* Excludes Short-term Investments, if any.

Bonds & Notes Sectors (% of Bonds & Notes)*

Government	43.8%
Residential Mortgage-Backed Securities	20.4%
Financial	11.1%
Consumer, Non-cyclical	5.5%
Energy	3.4%
Communications	2.9%
Technology	2.9%
Basic Materials	2.6%
Consumer, Cyclical	2.4%
Utilities	2.0%
Industrial	1.9%
Commercial Mortgage-Backed Securities	0.6%
Collateralized Mortgage Obligations	0.5%

* Excludes Short-term Investments, if any.

Largest Holdings [Text Block]

Ten Largest Holdings (% of Net Assets)*

NVIDIA Corp.	4.0%
Alphabet, Inc.	3.9%
Meta Platforms, Inc.	3.8%
Advanced Micro Devices, Inc.	3.4%
Amazon.com, Inc.	3.2%
Micron Technology, Inc.	2.8%
Broadcom, Inc.	2.7%
Microsoft Corp.	2.4%
Uber Technologies, Inc.	2.1%
AppLovin Corp.	2.0%

Material Fund Change [Text Block]

Updated Prospectus Phone Number

800-243-2729

Updated Prospectus Email Address

C000020636

Shareholder Report [Line Items]

Fund Name

Value Line Capital Appreciation Fund, Inc.

Class Name

Investor

Trading Symbol

VALIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Value Line Capital Appreciation Fund, Inc. (the "Fund") for the period of January 1, 2025 to December 31, 2025.

Additional Information [Text Block]

You can find additional information about the Fund at www.vlfunds.com. You can also request this information by contacting us at 1-800-243-2729 or investorservices@vlfunds.com.

Additional Information Phone Number

1-800-243-2729

Additional Information Email

Additional Information Website

Expenses [Text Block]

What were the Fund costs for last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Investor Class	$119	1.08%

Expenses Paid, Amount

$ 119

Expense Ratio, Percent

1.08%

Factors Affecting Performance [Text Block]

How did the Fund perform last year?

The Fund's Investor Class generated a total return of 20.87% during the 12 months ended December 31, 2025.

Performance Past Does Not Indicate Future [Text]

Line Graph [Table Text Block]

	Value Line Capital Appreciation Fund Inc.-Investor Class	S&P 500^® Index	60/40 S&P 500^® Index/Bloomberg US Aggregate Bond Index
12/15	$10,000	$10,000	$10,000
01/16	$9,381	$9,504	$9,757
02/16	$9,369	$9,491	$9,777
03/16	$9,803	$10,135	$10,211
04/16	$9,826	$10,174	$10,250
05/16	$9,998	$10,357	$10,362
06/16	$9,834	$10,384	$10,452
07/16	$10,328	$10,766	$10,710
08/16	$10,524	$10,782	$10,714
09/16	$10,492	$10,784	$10,713
10/16	$10,239	$10,587	$10,563
11/16	$10,205	$10,979	$10,698
12/16	$10,280	$11,196	$10,831
01/17	$10,680	$11,408	$10,962
02/17	$11,043	$11,861	$11,253
03/17	$11,175	$11,875	$11,258
04/17	$11,455	$11,997	$11,363
05/17	$11,394	$12,166	$11,494
06/17	$11,749	$12,242	$11,532
07/17	$12,150	$12,494	$11,694
08/17	$12,381	$12,532	$11,757
09/17	$12,466	$12,790	$11,881
10/17	$12,454	$13,089	$12,050
11/17	$12,612	$13,490	$12,265
12/17	$12,733	$13,640	$12,370
01/18	$13,590	$14,421	$12,738
02/18	$13,257	$13,890	$12,408
03/18	$13,071	$13,537	$12,250
04/18	$13,211	$13,589	$12,242
05/18	$13,595	$13,916	$12,454
06/18	$13,815	$14,002	$12,494
07/18	$13,879	$14,523	$12,774
08/18	$14,353	$14,996	$13,056
09/18	$14,545	$15,081	$13,067
10/18	$13,073	$14,050	$12,490
11/18	$13,418	$14,337	$12,673
12/18	$12,387	$13,042	$12,079
01/19	$13,925	$14,087	$12,711
02/19	$14,188	$14,540	$12,953
03/19	$14,493	$14,822	$13,204
04/19	$14,909	$15,422	$13,526
05/19	$13,980	$14,442	$13,106
06/19	$14,992	$15,460	$13,726
07/19	$14,923	$15,682	$13,857
08/19	$14,396	$15,434	$13,869
09/19	$14,022	$15,723	$13,995
10/19	$14,202	$16,063	$14,194
11/19	$15,227	$16,646	$14,500
12/19	$15,624	$17,149	$14,758
01/20	$15,640	$17,142	$14,869
02/20	$15,015	$15,731	$14,241
03/20	$13,079	$13,788	$13,152
04/20	$15,335	$15,555	$14,257
05/20	$16,569	$16,296	$14,691
06/20	$17,210	$16,620	$14,904
07/20	$17,819	$17,558	$15,497
08/20	$18,795	$18,820	$16,115
09/20	$18,307	$18,105	$15,744
10/20	$18,018	$17,623	$15,465
11/20	$19,725	$19,552	$16,541
12/20	$20,786	$20,304	$16,932
01/21	$20,963	$20,099	$16,781
02/21	$21,495	$20,653	$16,962
03/21	$21,301	$21,558	$17,323
04/21	$22,026	$22,708	$17,932
05/21	$21,769	$22,867	$18,031
06/21	$22,574	$23,401	$18,334
07/21	$22,462	$23,956	$18,677
08/21	$23,009	$24,685	$19,004
09/21	$22,171	$23,537	$18,408
10/21	$23,090	$25,186	$19,179
11/21	$21,962	$25,011	$19,122
12/21	$22,197	$26,132	$19,617
01/22	$20,925	$24,780	$18,839
02/22	$20,119	$24,038	$18,416
03/22	$20,298	$24,931	$18,622
04/22	$17,844	$22,757	$17,365
05/22	$17,539	$22,798	$17,429
06/22	$15,801	$20,916	$16,456
07/22	$17,109	$22,845	$17,528
08/22	$16,912	$21,913	$16,901
09/22	$15,354	$19,895	$15,675
10/22	$16,196	$21,506	$16,355
11/22	$16,823	$22,708	$17,144
12/22	$15,576	$21,399	$16,520
01/23	$17,674	$22,744	$17,346
02/23	$17,219	$22,189	$16,913
03/23	$17,773	$23,004	$17,457
04/23	$17,694	$23,363	$17,663
05/23	$18,090	$23,464	$17,632
06/23	$18,901	$25,015	$18,306
07/23	$19,772	$25,818	$18,654
08/23	$19,277	$25,407	$18,428
09/23	$18,446	$24,196	$17,714
10/23	$17,753	$23,687	$17,378
11/23	$19,594	$25,850	$18,645
12/23	$20,940	$27,025	$19,439
01/24	$20,900	$27,479	$19,614
02/24	$22,157	$28,946	$20,131
03/24	$23,034	$29,878	$20,594
04/24	$21,618	$28,657	$19,882
05/24	$22,356	$30,078	$20,608
06/24	$23,134	$31,157	$21,130
07/24	$22,954	$31,537	$21,481
08/24	$23,293	$32,302	$21,917
09/24	$24,011	$32,992	$22,316
10/24	$24,191	$32,692	$21,973
11/24	$26,026	$34,611	$22,840
12/24	$25,385	$33,786	$22,363
01/25	$26,270	$34,727	$22,785
02/25	$25,647	$34,274	$22,807
03/25	$24,159	$32,343	$22,039
04/25	$24,722	$32,124	$21,984
05/25	$26,430	$34,146	$22,751
06/25	$28,199	$35,882	$23,586
07/25	$28,481	$36,687	$23,878
08/25	$28,883	$37,431	$24,283
09/25	$30,390	$38,797	$24,921
10/25	$31,294	$39,706	$25,333
11/25	$30,852	$39,803	$25,433
12/25	$30,682	$39,827	$25,428

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Investor Class	20.87%	8.10%	11.86%
S&P 500^® Index	17.88%	14.42%	14.82%
60/40 S&P 500^® Index/Bloomberg US Aggregate Bond Index	13.70%	8.47%	9.78%

AssetsNet

$ 532,512,147

Holdings Count | Holding

212

Advisory Fees Paid, Amount

$ 3,143,973

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$532,512,147
# of Portfolio Holdings	212
Portfolio Turnover Rate	43%
Total Advisory Fees Paid	$3,143,973

Holdings [Text Block]

Asset Allocation (% of Net Assets)

Value	Value
Common Stocks	65.1%
Bonds & Notes	29.1%
Cash & Other Assets - Net	5.8%

Common Stock Sectors (% of Common Stocks)*

Information Technology	41.0%
Communication Services	16.6%
Financials	13.3%
Consumer Discretionary	13.1%
Healthcare	9.6%
Industrials	5.4%
Energy	1.0%

* Excludes Short-term Investments, if any.

Bonds & Notes Sectors (% of Bonds & Notes)*

Government	43.8%
Residential Mortgage-Backed Securities	20.4%
Financial	11.1%
Consumer, Non-cyclical	5.5%
Energy	3.4%
Communications	2.9%
Technology	2.9%
Basic Materials	2.6%
Consumer, Cyclical	2.4%
Utilities	2.0%
Industrial	1.9%
Commercial Mortgage-Backed Securities	0.6%
Collateralized Mortgage Obligations	0.5%

* Excludes Short-term Investments, if any.

Largest Holdings [Text Block]

Ten Largest Holdings (% of Net Assets)*

NVIDIA Corp.	4.0%
Alphabet, Inc.	3.9%
Meta Platforms, Inc.	3.8%
Advanced Micro Devices, Inc.	3.4%
Amazon.com, Inc.	3.2%
Micron Technology, Inc.	2.8%
Broadcom, Inc.	2.7%
Microsoft Corp.	2.4%
Uber Technologies, Inc.	2.1%
AppLovin Corp.	2.0%

Material Fund Change [Text Block]

Updated Prospectus Phone Number

800-243-2729

Updated Prospectus Email Address