Value Line Select Core Fund, Inc. Investor Class Institutional Class Growth Style Risk [Member] Market Risk [Member] Equity Securities Risk [Member] Sector Allocation Risk [Member] Focused Portfolio Risk [Member] Small and Mid-Sized Company Risk [Member] Ranking System Risk [Member] Active Management Risk [Member] Foreign Investments Risk [Member] Market Disruption Risk [Member] Cybersecurity Risk [Member] S&P 500® Index (reflects no deduction for fees, expenses or taxes) Market Risk Member Ranking System Risk Member Small And Mid Sized Company Risk Member C000193015 Member Cybersecurity Risk Member Equity Securities Risk Member Focused Portfolio Risk Member S000007574 Member Growth Style Risk Member Active Management Risk Member index_ SP_500_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Foreign Investments Risk Member C000020639 Member Market Disruption Risk Member Sector Allocation Risk Member