v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
VALUE LINE CAPITAL APPRECIATION FUND INC      
Prospectus [Line Items]      
Average Annual Return, Percent 20.87% 8.10% 11.86%
VALUE LINE CAPITAL APPRECIATION FUND INC | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 18.97% 6.65% 10.18%
VALUE LINE CAPITAL APPRECIATION FUND INC | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 13.27% 5.99% 9.24%
Institutional      
Prospectus [Line Items]      
Average Annual Return, Percent 21.07% 8.36% 12.14%
S&P 500® Index (reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 17.88% 14.42% 14.82%
60/40 S&P 500® Index/Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 13.70% [1] 8.47% 9.78%
[1] This secondary custom index is composed of a 60% weighting in the S&P 500® Index and a 40% weighting in the Bloomberg US Aggregate Bond Index, calculated on a total return basis with dividends reinvested.