v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Value Line Select Core Fund, Inc.
Entity Central Index Key 0000102767
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000193015  
Shareholder Report [Line Items]  
Fund Name Value Line Select Core Fund, Inc.
Class Name Institutional
Trading Symbol VILSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Value Line Select Core Fund, Inc. (formerly Value Line Select Growth Fund, Inc.) (the "Fund") for the period of January 1, 2026 to June 30, 2026.
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 <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;">www.vlfunds.com</span>
Expenses [Text Block]

What were the Fund costs for last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$45
0.93%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.93% [1]
AssetsNet $ 294,472,604
Holdings Count | Holding 41
InvestmentCompanyPortfolioTurnover 40.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$294,472,604
# of Portfolio Holdings
41
Portfolio Turnover Rate
40%
Holdings [Text Block]

Asset Allocation (% of Net Assets)

Group By Asset Type Chart
Table Summary
Value
Value
Common Stocks
97.9%
Cash & Other Assets - Net
2.1%

Sector Weightings (% of Total Investments In Securities)*

Group By Sector Chart
Table Summary
Value
Value
Communication Services
0.9%
Energy
2.4%
Consumer Discretionary
2.5%
Materials
4.5%
Consumer Staples
5.9%
Healthcare
6.9%
Financials
11.2%
Industrials
27.1%
Information Technology
38.6%

* Excludes Short-term Investments, if any. 
Largest Holdings [Text Block]

Ten Largest Holdings (% of Net Assets)*

Table Summary
Cadence Design Systems, Inc.
8.5%
Trane Technologies PLC
8.0%
Cintas Corp.
5.8%
Motorola Solutions, Inc.
5.1%
Mastercard, Inc.
5.0%
Republic Services, Inc.
4.9%
TransDigm Group, Inc.
4.8%
Costco Wholesale Corp.
4.6%
ServiceNow, Inc.
4.0%
Roper Technologies, Inc.
3.2%
Updated Prospectus Phone Number 800-243-2729
Updated Prospectus Email Address <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>
C000020639  
Shareholder Report [Line Items]  
Fund Name Value Line Select Core Fund, Inc.
Class Name Investor
Trading Symbol VALSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Value Line Select Core Fund, Inc. (formerly Value Line Select Growth Fund, Inc.) (the "Fund") for the period of January 1, 2026 to June 30, 2026.
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 <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;">www.vlfunds.com</span>
Expenses [Text Block]

What were the Fund costs for last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$57
1.18%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 57
Expense Ratio, Percent 1.18% [2]
AssetsNet $ 294,472,604
Holdings Count | Holding 41
InvestmentCompanyPortfolioTurnover 40.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$294,472,604
# of Portfolio Holdings
41
Portfolio Turnover Rate
40%
Holdings [Text Block]

Asset Allocation (% of Net Assets)

Group By Asset Type Chart
Table Summary
Value
Value
Common Stocks
97.9%
Cash & Other Assets - Net
2.1%

Sector Weightings (% of Total Investments In Securities)*

Group By Sector Chart
Table Summary
Value
Value
Communication Services
0.9%
Energy
2.4%
Consumer Discretionary
2.5%
Materials
4.5%
Consumer Staples
5.9%
Healthcare
6.9%
Financials
11.2%
Industrials
27.1%
Information Technology
38.6%

* Excludes Short-term Investments, if any. 
Largest Holdings [Text Block]

Ten Largest Holdings (% of Net Assets)*

Table Summary
Cadence Design Systems, Inc.
8.5%
Trane Technologies PLC
8.0%
Cintas Corp.
5.8%
Motorola Solutions, Inc.
5.1%
Mastercard, Inc.
5.0%
Republic Services, Inc.
4.9%
TransDigm Group, Inc.
4.8%
Costco Wholesale Corp.
4.6%
ServiceNow, Inc.
4.0%
Roper Technologies, Inc.
3.2%
Updated Prospectus Phone Number 800-243-2729
Updated Prospectus Email Address <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>
[1] Annualized.
[2] Annualized.