v3.25.4
Shareholder Report, Line Graph (Details) - USD ($)
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Dec. 31, 2015
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Feb. 29, 2016
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Dec. 31, 2025
Dec. 31, 2016
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Feb. 28, 2017
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Apr. 30, 2017
May 31, 2017
Jun. 30, 2017
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Aug. 31, 2017
Sep. 30, 2017
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Nov. 30, 2017
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Jan. 31, 2018
Feb. 28, 2018
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Apr. 30, 2018
May 31, 2018
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Jul. 31, 2018
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Sep. 30, 2018
Oct. 31, 2018
Nov. 30, 2018
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Jan. 31, 2019
Feb. 28, 2019
Mar. 31, 2019
Apr. 30, 2019
May 31, 2019
Jun. 30, 2019
Jul. 31, 2019
Aug. 31, 2019
Sep. 30, 2019
Oct. 31, 2019
Nov. 30, 2019
Dec. 31, 2019
Jan. 31, 2020
Feb. 29, 2020
Mar. 31, 2020
Apr. 30, 2020
May 31, 2020
Jun. 30, 2020
Jul. 31, 2020
Aug. 31, 2020
Sep. 30, 2020
Oct. 31, 2020
Nov. 30, 2020
Dec. 31, 2020
Jan. 31, 2021
Feb. 28, 2021
Mar. 31, 2021
Apr. 30, 2021
May 31, 2021
Jun. 30, 2021
Jul. 31, 2021
Aug. 31, 2021
Sep. 30, 2021
Oct. 31, 2021
Nov. 30, 2021
Dec. 31, 2021
Jan. 31, 2022
Feb. 28, 2022
Mar. 31, 2022
Apr. 30, 2022
May 31, 2022
Jun. 30, 2022
Jul. 31, 2022
Aug. 31, 2022
Sep. 30, 2022
Oct. 31, 2022
Nov. 30, 2022
Dec. 31, 2022
Jan. 31, 2023
Feb. 28, 2023
Mar. 31, 2023
Apr. 30, 2023
May 31, 2023
Jun. 30, 2023
Jul. 31, 2023
Aug. 31, 2023
Sep. 30, 2023
Oct. 31, 2023
Nov. 30, 2023
Dec. 31, 2023
Jan. 31, 2024
Feb. 29, 2024
Mar. 31, 2024
Apr. 30, 2024
May 31, 2024
Jun. 30, 2024
Jul. 31, 2024
Aug. 31, 2024
Sep. 30, 2024
Oct. 31, 2024
Nov. 30, 2024
Dec. 31, 2024
Jan. 31, 2025
Feb. 28, 2025
Mar. 31, 2025
Apr. 30, 2025
May 31, 2025
Jun. 30, 2025
Jul. 31, 2025
Aug. 31, 2025
Sep. 30, 2025
Oct. 31, 2025
Nov. 30, 2025
Dec. 31, 2025
C000162171                                                                                                                                                                                                                                                    
Account Value [Line Items]                                                                                                                                                                                                                                                    
Line Graph and Table Measure Name                         Value Line Capital Appreciation Fund Inc.-Institutional Class                                                                                                                                                                                                                          
Accumulated Value $ 10,000 $ 9,364 $ 9,364 $ 9,803 $ 9,837 $ 10,011 $ 9,858 $ 10,344 $ 10,541 $ 10,520 $ 10,265 $ 10,231   $ 10,306 $ 10,710 $ 11,076 $ 11,210 $ 11,491 $ 11,442 $ 11,801 $ 12,205 $ 12,438 $ 12,524 $ 12,511 $ 12,671 $ 12,812 $ 13,666 $ 13,342 $ 13,150 $ 13,293 $ 13,681 $ 13,911 $ 13,976 $ 14,455 $ 14,650 $ 13,172 $ 13,522 $ 12,478 $ 14,035 $ 14,302 $ 14,625 $ 15,032 $ 14,106 $ 15,130 $ 15,060 $ 14,527 $ 14,162 $ 14,344 $ 15,383 $ 15,785 $ 15,816 $ 15,183 $ 13,221 $ 15,507 $ 16,774 $ 17,407 $ 18,025 $ 19,029 $ 18,534 $ 18,241 $ 19,986 $ 21,061 $ 21,241 $ 21,780 $ 21,600 $ 22,335 $ 22,074 $ 22,906 $ 22,792 $ 23,347 $ 22,514 $ 23,445 $ 22,302 $ 22,562 $ 21,251 $ 20,450 $ 20,632 $ 18,137 $ 17,828 $ 16,061 $ 17,391 $ 17,209 $ 15,642 $ 16,480 $ 17,117 $ 15,853 $ 18,011 $ 17,548 $ 18,112 $ 18,032 $ 18,435 $ 19,282 $ 20,170 $ 19,665 $ 18,838 $ 18,112 $ 20,008 $ 21,387 $ 21,346 $ 22,630 $ 23,526 $ 22,080 $ 22,854 $ 23,648 $ 23,465 $ 23,831 $ 24,544 $ 24,748 $ 26,642 $ 25,987 $ 26,892 $ 26,275 $ 24,752 $ 25,328 $ 27,077 $ 28,888 $ 29,196 $ 29,608 $ 31,151 $ 32,097 $ 31,645 $ 31,462
C000020636                                                                                                                                                                                                                                                    
Account Value [Line Items]                                                                                                                                                                                                                                                    
Line Graph and Table Measure Name                         Value Line Capital Appreciation Fund Inc.-Investor Class                                                                                                                                                                                                                          
Accumulated Value 10,000 9,381 9,369 9,803 9,826 9,998 9,834 10,328 10,524 10,492 10,239 10,205   10,280 10,680 11,043 11,175 11,455 11,394 11,749 12,150 12,381 12,466 12,454 12,612 12,733 13,590 13,257 13,071 13,211 13,595 13,815 13,879 14,353 14,545 13,073 13,418 12,387 13,925 14,188 14,493 14,909 13,980 14,992 14,923 14,396 14,022 14,202 15,227 15,624 15,640 15,015 13,079 15,335 16,569 17,210 17,819 18,795 18,307 18,018 19,725 20,786 20,963 21,495 21,301 22,026 21,769 22,574 22,462 23,009 22,171 23,090 21,962 22,197 20,925 20,119 20,298 17,844 17,539 15,801 17,109 16,912 15,354 16,196 16,823 15,576 17,674 17,219 17,773 17,694 18,090 18,901 19,772 19,277 18,446 17,753 19,594 20,940 20,900 22,157 23,034 21,618 22,356 23,134 22,954 23,293 24,011 24,191 26,026 25,385 26,270 25,647 24,159 24,722 26,430 28,199 28,481 28,883 30,390 31,294 30,852 30,682
VALUELINE INDEX: S&P 500®                                                                                                                                                                                                                                                    
Account Value [Line Items]                                                                                                                                                                                                                                                    
Line Graph and Table Measure Name                         S&P 500<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Index                                                                                                                                                                                                                          
Accumulated Value 10,000 9,504 9,491 10,135 10,174 10,357 10,384 10,766 10,782 10,784 10,587 10,979   11,196 11,408 11,861 11,875 11,997 12,166 12,242 12,494 12,532 12,790 13,089 13,490 13,640 14,421 13,890 13,537 13,589 13,916 14,002 14,523 14,996 15,081 14,050 14,337 13,042 14,087 14,540 14,822 15,422 14,442 15,460 15,682 15,434 15,723 16,063 16,646 17,149 17,142 15,731 13,788 15,555 16,296 16,620 17,558 18,820 18,105 17,623 19,552 20,304 20,099 20,653 21,558 22,708 22,867 23,401 23,956 24,685 23,537 25,186 25,011 26,132 24,780 24,038 24,931 22,757 22,798 20,916 22,845 21,913 19,895 21,506 22,708 21,399 22,744 22,189 23,004 23,363 23,464 25,015 25,818 25,407 24,196 23,687 25,850 27,025 27,479 28,946 29,878 28,657 30,078 31,157 31,537 32,302 32,992 32,692 34,611 33,786 34,727 34,274 32,343 32,124 34,146 35,882 36,687 37,431 38,797 39,706 39,803 39,827
VALUELINE INDEX: S&P 500®                                                                                                                                                                                                                                                    
Account Value [Line Items]                                                                                                                                                                                                                                                    
Line Graph and Table Measure Name                         S&P 500<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Index                                                                                                                                                                                                                          
Accumulated Value 10,000 9,504 9,491 10,135 10,174 10,357 10,384 10,766 10,782 10,784 10,587 10,979   11,196 11,408 11,861 11,875 11,997 12,166 12,242 12,494 12,532 12,790 13,089 13,490 13,640 14,421 13,890 13,537 13,589 13,916 14,002 14,523 14,996 15,081 14,050 14,337 13,042 14,087 14,540 14,822 15,422 14,442 15,460 15,682 15,434 15,723 16,063 16,646 17,149 17,142 15,731 13,788 15,555 16,296 16,620 17,558 18,820 18,105 17,623 19,552 20,304 20,099 20,653 21,558 22,708 22,867 23,401 23,956 24,685 23,537 25,186 25,011 26,132 24,780 24,038 24,931 22,757 22,798 20,916 22,845 21,913 19,895 21,506 22,708 21,399 22,744 22,189 23,004 23,363 23,464 25,015 25,818 25,407 24,196 23,687 25,850 27,025 27,479 28,946 29,878 28,657 30,078 31,157 31,537 32,302 32,992 32,692 34,611 33,786 34,727 34,274 32,343 32,124 34,146 35,882 36,687 37,431 38,797 39,706 39,803 39,827
60/40 S&P 500® Index/Bloomberg US Aggregate Bond Index                                                                                                                                                                                                                                                    
Account Value [Line Items]                                                                                                                                                                                                                                                    
Line Graph and Table Measure Name                         60/40 S&P 500<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Index/Bloomberg US Aggregate Bond Index                                                                                                                                                                                                                          
Accumulated Value 10,000 9,757 9,777 10,211 10,250 10,362 10,452 10,710 10,714 10,713 10,563 10,698   10,831 10,962 11,253 11,258 11,363 11,494 11,532 11,694 11,757 11,881 12,050 12,265 12,370 12,738 12,408 12,250 12,242 12,454 12,494 12,774 13,056 13,067 12,490 12,673 12,079 12,711 12,953 13,204 13,526 13,106 13,726 13,857 13,869 13,995 14,194 14,500 14,758 14,869 14,241 13,152 14,257 14,691 14,904 15,497 16,115 15,744 15,465 16,541 16,932 16,781 16,962 17,323 17,932 18,031 18,334 18,677 19,004 18,408 19,179 19,122 19,617 18,839 18,416 18,622 17,365 17,429 16,456 17,528 16,901 15,675 16,355 17,144 16,520 17,346 16,913 17,457 17,663 17,632 18,306 18,654 18,428 17,714 17,378 18,645 19,439 19,614 20,131 20,594 19,882 20,608 21,130 21,481 21,917 22,316 21,973 22,840 22,363 22,785 22,807 22,039 21,984 22,751 23,586 23,878 24,283 24,921 25,333 25,433 25,428
60/40 S&P 500® Index/Bloomberg US Aggregate Bond Index                                                                                                                                                                                                                                                    
Account Value [Line Items]                                                                                                                                                                                                                                                    
Line Graph and Table Measure Name                         60/40 S&P 500<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Index/Bloomberg US Aggregate Bond Index                                                                                                                                                                                                                          
Accumulated Value $ 10,000 $ 9,757 $ 9,777 $ 10,211 $ 10,250 $ 10,362 $ 10,452 $ 10,710 $ 10,714 $ 10,713 $ 10,563 $ 10,698   $ 10,831 $ 10,962 $ 11,253 $ 11,258 $ 11,363 $ 11,494 $ 11,532 $ 11,694 $ 11,757 $ 11,881 $ 12,050 $ 12,265 $ 12,370 $ 12,738 $ 12,408 $ 12,250 $ 12,242 $ 12,454 $ 12,494 $ 12,774 $ 13,056 $ 13,067 $ 12,490 $ 12,673 $ 12,079 $ 12,711 $ 12,953 $ 13,204 $ 13,526 $ 13,106 $ 13,726 $ 13,857 $ 13,869 $ 13,995 $ 14,194 $ 14,500 $ 14,758 $ 14,869 $ 14,241 $ 13,152 $ 14,257 $ 14,691 $ 14,904 $ 15,497 $ 16,115 $ 15,744 $ 15,465 $ 16,541 $ 16,932 $ 16,781 $ 16,962 $ 17,323 $ 17,932 $ 18,031 $ 18,334 $ 18,677 $ 19,004 $ 18,408 $ 19,179 $ 19,122 $ 19,617 $ 18,839 $ 18,416 $ 18,622 $ 17,365 $ 17,429 $ 16,456 $ 17,528 $ 16,901 $ 15,675 $ 16,355 $ 17,144 $ 16,520 $ 17,346 $ 16,913 $ 17,457 $ 17,663 $ 17,632 $ 18,306 $ 18,654 $ 18,428 $ 17,714 $ 17,378 $ 18,645 $ 19,439 $ 19,614 $ 20,131 $ 20,594 $ 19,882 $ 20,608 $ 21,130 $ 21,481 $ 21,917 $ 22,316 $ 21,973 $ 22,840 $ 22,363 $ 22,785 $ 22,807 $ 22,039 $ 21,984 $ 22,751 $ 23,586 $ 23,878 $ 24,283 $ 24,921 $ 25,333 $ 25,433 $ 25,428