Value Line Small Cap Opportunities Fund, Inc. Value Line Small Cap Opportunities Fund, Inc. Institutional Growth Style Risk [Member] Market Risk [Member] Equity Securities Risk [Member] Sector Allocation Risk [Member] Small and Mid-Sized Company Risk [Member] Liquidity Risk [Member] Ranking Systems Risk [Member] Active Management Risk [Member] Market Disruption Risk [Member] Cybersecurity Risk [Member] Russell 2000 Index (Reflects no deduction for fees, expenses or taxes) Market Risk Member C000020634 Member Small And Mid Sized Company Risk Member Ranking Systems Risk Member index_ Russell_2000_ Index_ Reflects_no_deduction_for_fees_expenses_or_taxes Member Cybersecurity Risk Member Equity Securities Risk Member S000007569 Member Growth Style Risk Member Active Management Risk Member C000162155 Member Liquidity Risk Member Market Disruption Risk Member Sector Allocation Risk Member