v3.25.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 110 Months Ended 120 Months Ended
Apr. 30, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
 [1]
Dec. 31, 2024
VALUE LINE CAPITAL APPRECIATION FUND INC          
Prospectus [Line Items]          
Average Annual Return, Percent   21.23% 10.19%   9.67%
VALUE LINE CAPITAL APPRECIATION FUND INC | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   20.92% 8.77%   8.02%
VALUE LINE CAPITAL APPRECIATION FUND INC | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   12.64% 7.80%   7.39%
Institutional          
Prospectus [Line Items]          
Average Annual Return, Percent   21.50% 10.48% 10.58%  
Performance Inception Date Nov. 02, 2015        
S&P 500® Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent   25.02% 14.53% 14.05% 13.10%
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 [2]   15.04% 8.67% 9.06% 8.52%
[1] Institutional Class inception date.
[2] 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.