This annual shareholder report contains important information about Value Line Mid Cap Focused Fund, Inc. (the "Fund") for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

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;">investorservices@vlfunds.com</span>

Additional Information Website

Expenses [Text Block]

What were the Fund costs for last year?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Institutional Class	$90	0.87%

Expenses Paid, Amount

$ 90

Expense Ratio, Percent

0.87%

Factors Affecting Performance [Text Block]

How did the Fund perform last year?

The Fund's Institutional Class generated a total return of 7.87% during the year ended December 31, 2024.

• The Fund delivered positive absolute returns but underperformed the S&P 500^® Index primarily because mid-cap stocks lagged their large-cap counterparts, making the S&P 500^® Index, a large-cap index, a difficult benchmark to outpace for this Fund.

• The Fund, given its mid-cap focus, did not own any of the mega-cap stocks, i.e., the largest of the large-cap stocks, that drove the two strongest sectors of the S&P 500^® Index—communication services and information technology. Weak individual stock selection in health care, consumer discretionary and financials further dampened the Fund’s relative results as did having overweights to the lagging health care and industrials sectors.

• Effective stock selection in the industrials and materials sectors contributed positively. Having no allocation to the laggard energy sector also boosted the Fund’s relative results.

• The Fund’s relative results were hurt most by not owning computer graphics processors manufacturer NVIDIA, whose shares rose approximately 170% during the annual period. Additionally, holding positions in information technology services provider CDW and diagnostics and research services provider to the life sciences industry Iqvia detracted. Each experienced a double-digit share price decline during the annual period due to weaker than expected operating performance.

• Among the individual stocks that contributed most positively to the Fund’s relative results were analytics software and services provider Fair Isaac (a.k.a. FICO), integrated information management solutions and services provider for the public sector Tyler Technologies and climate control products manufacturer Lennox International. Each of these companies enjoyed a robust double-digit share price gain during the annual period due to stronger than expected operating performance.

Performance Past Does Not Indicate Future [Text]

<p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 9.33333px; font-weight: 400; grid-area: auto; line-height: 11.2px; margin: 0px; overflow: visible; text-align: justify;">The performance data quoted represent past performance and are no guarantee of future performance. The investment return and principal value of an investment will fluctuate so that an investment, when redeemed, may be worth more or less than its original cost. The performance data includes reinvestments of all dividends and distributions but does not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.</p>

Line Graph [Table Text Block]

	Value Line Mid Cap Focused Fund Inc.-Institutional Class	S&P 500^® Index	S&P MidCap 400^® Index
8/14/2017	$10,000	$10,000	$10,000
8/31/2017	$10,071	$10,139	$10,126
9/30/2017	$10,247	$10,348	$10,523
10/31/2017	$10,488	$10,589	$10,761
11/30/2017	$10,701	$10,914	$11,157
12/31/2017	$10,689	$11,035	$11,181
1/31/2018	$11,274	$11,667	$11,502
2/28/2018	$10,940	$11,237	$10,992
3/31/2018	$10,956	$10,951	$11,094
4/30/2018	$10,851	$10,994	$11,066
5/31/2018	$11,073	$11,258	$11,522
6/30/2018	$11,335	$11,328	$11,571
7/31/2018	$11,875	$11,749	$11,775
8/31/2018	$12,454	$12,132	$12,151
9/30/2018	$12,660	$12,201	$12,018
10/31/2018	$11,697	$11,367	$10,871
11/30/2018	$12,137	$11,599	$11,210
12/31/2018	$11,221	$10,551	$9,942
1/31/2019	$12,081	$11,397	$10,982
2/28/2019	$12,801	$11,763	$11,447
3/31/2019	$13,205	$11,991	$11,382
4/30/2019	$13,703	$12,477	$11,840
5/31/2019	$13,445	$11,684	$10,896
6/30/2019	$14,358	$12,508	$11,729
7/31/2019	$14,499	$12,687	$11,868
8/31/2019	$14,721	$12,486	$11,370
9/30/2019	$14,634	$12,720	$11,718
10/31/2019	$14,639	$12,996	$11,851
11/30/2019	$15,166	$13,467	$12,203
12/31/2019	$15,225	$13,874	$12,546
1/31/2020	$15,772	$13,868	$12,219
2/29/2020	$14,594	$12,727	$11,059
3/31/2020	$12,685	$11,155	$8,820
4/30/2020	$13,500	$12,585	$10,071
5/31/2020	$14,916	$13,184	$10,807
6/30/2020	$14,838	$13,446	$10,943
7/31/2020	$15,808	$14,204	$11,448
8/31/2020	$16,362	$15,225	$11,850
9/30/2020	$15,957	$14,647	$11,465
10/31/2020	$15,802	$14,257	$11,715
11/30/2020	$17,480	$15,818	$13,387
12/31/2020	$18,307	$16,426	$14,260
1/31/2021	$17,365	$16,260	$14,474
2/28/2021	$17,823	$16,709	$15,459
3/31/2021	$18,507	$17,441	$16,181
4/30/2021	$19,603	$18,371	$16,909
5/31/2021	$19,493	$18,500	$16,943
6/30/2021	$19,777	$18,932	$16,769
7/31/2021	$20,447	$19,381	$16,827
8/31/2021	$20,970	$19,971	$17,155
9/30/2021	$19,777	$19,042	$16,474
10/31/2021	$21,021	$20,376	$17,443
11/30/2021	$20,576	$20,235	$16,931
12/31/2021	$22,012	$21,142	$17,791
1/31/2022	$20,319	$20,048	$16,508
2/28/2022	$20,172	$19,447	$16,692
3/31/2022	$20,829	$20,169	$16,923
4/30/2022	$19,486	$18,411	$15,720
5/31/2022	$19,381	$18,444	$15,838
6/30/2022	$18,332	$16,922	$14,314
7/31/2022	$19,829	$18,482	$15,867
8/31/2022	$19,213	$17,728	$15,375
9/30/2022	$17,905	$16,096	$13,962
10/31/2022	$19,367	$17,399	$15,430
11/30/2022	$20,857	$18,371	$16,374
12/31/2022	$19,954	$17,313	$15,467
1/31/2023	$21,229	$18,400	$16,895
2/28/2023	$20,929	$17,951	$16,588
3/31/2023	$21,342	$18,611	$16,056
4/30/2023	$21,259	$18,901	$15,930
5/31/2023	$21,034	$18,983	$15,422
6/30/2023	$22,384	$20,238	$16,835
7/31/2023	$22,504	$20,888	$17,529
8/31/2023	$22,489	$20,555	$17,022
9/30/2023	$21,492	$19,575	$16,128
10/31/2023	$20,719	$19,163	$15,267
11/30/2023	$22,909	$20,914	$16,566
12/31/2023	$24,420	$21,864	$18,010
1/31/2024	$24,555	$22,231	$17,701
2/29/2024	$25,871	$23,418	$18,753
3/31/2024	$26,299	$24,172	$19,802
4/30/2024	$24,675	$23,184	$18,610
5/31/2024	$25,337	$24,334	$19,427
6/30/2024	$25,645	$25,207	$19,120
7/31/2024	$27,149	$25,514	$20,230
8/31/2024	$27,931	$26,133	$20,214
9/30/2024	$28,209	$26,691	$20,448
10/31/2024	$27,014	$26,449	$20,303
11/30/2024	$28,269	$28,001	$22,092
12/31/2024	$26,341	$27,334	$20,518

Average Annual Return [Table Text Block]

	1 Year	5 Years	Since Inception^{Footnote Reference*}
Institutional Class	7.87%	11.59%	14.02%
S&P 500^® Index	25.02%	14.53%	14.59%
S&P MidCap 400^® Index	13.93%	10.34%	10.22%

Performance Inception Date

Aug. 14, 2017

AssetsNet

$ 1,938,660,788

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 10,754,687

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,938,660,788
# of Portfolio Holdings	43
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$10,754,687

Holdings [Text Block]

Tyler Technologies, Inc.	5.7%
MSCI, Inc.	5.6%
HEICO Corp.	5.4%
Lennox International, Inc.	5.0%
Waste Connections, Inc.	4.9%
Gartner, Inc.	4.8%
Fair Isaac Corp.	4.4%
Monolithic Power Systems, Inc.	3.5%
TransDigm Group, Inc.	3.4%
Casey's General Stores, Inc.	3.3%

Value	Value
Common Stocks	97.1%
Cash & Other Assets - Net	2.9%

Material Fund Change [Text Block]

Updated Prospectus Phone Number

800-243-2729

Updated Prospectus Email Address

C000020635

Shareholder Report [Line Items]

Fund Name

Value Line Mid Cap Focused Fund, Inc.

Class Name

Investor

Trading Symbol

VLIFX

Annual or Semi-Annual Statement [Text Block]