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 Gabelli Value 25 Fund Inc
Entity Central Index Key 0000853438
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
C000088645  
Shareholder Report [Line Items]  
Fund Name The Gabelli Value 25 Fund Inc.
Class Name Class AAA
Trading Symbol GVCAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Value 25 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, including the Fund’s prospectus, financial information, holdings, and proxy voting information, at https://gabelli.com/ticker/GVCAX/. You can also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website https://gabelli.com/ticker/GVCAX/
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Value 25 Fund Inc. - Class AAA
$75
1.44%
Expenses Paid, Amount $ 75
Expense Ratio, Percent 1.44%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2026, the Gabelli Value 25 Fund underperformed its benchmarks, the S&P 500 and Russell 1000 Value Indices.  Although the market remains narrow with the top ten companies representing nearly 40% of total capitalization, semiconductors drove performance (up 104%) while the Magnificent 7 was essentially flat for the first half. Financial engineering remains alive and well; worldwide deal activity hit another all-time high in the second quarter. Top contributors to performance included Madison Square Garden Sports, Sphere Entertainment, and Bank of New York Mellon. Detractors included Sony Group, American Express Corp., and Fox Corp. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
Table Summary
The Gabelli Value 25 Fund Inc. - Class AAA
S&P 500 Index
Russell 1000 Value Index
06/16
10,000
10,000
10,000
06/17
11,306
11,790
11,553
06/18
11,982
13,484
12,335
06/19
12,481
14,889
13,379
06/20
10,748
16,007
12,196
06/21
15,677
22,537
17,523
06/22
12,934
20,143
16,328
06/23
13,767
24,090
18,212
06/24
14,641
30,006
20,591
06/25
17,938
34,555
23,412
06/26
22,528
42,268
29,761
Average Annual Return [Table Text Block]
Table Summary
6 months
1 Year
5 Year
10 Year
The Gabelli Value 25 Fund Inc. - Class AAA
9.69%
25.59%
7.52%
8.46%
S&P 500 Index
10.21%
22.32%
13.41%
15.51%
Russell 1000 Value Index
16.26%
27.12%
11.17%
11.52%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on Fund distributions or the redemption of Fund shares.
AssetsNet $ 249,845,304
Holdings Count | Holding 86
Advisory Fees Paid, Amount $ 1,151,472
InvestmentCompanyPortfolioTurnover 9.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$249,845,304
  • Number of Portfolio Holdings86
  • Portfolio Turnover Rate9%
  • Management Fees$1,151,472
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Table Summary
Common Stocks
93.5%
U.S. Government Obligations
6.5%
Other Assets and Liabilities (Net)Footnote Reference*
0.0%
FootnoteDescription
Footnote*
Amount represents less than 0.05%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Table Summary
Industry Weighting
.
Entertainment
25.1%
Financial Services
14.2%
Metals and Mining
7.3%
U.S. Government Obligations
6.5%
Diversified Industrial
6.4%
Energy and Utilities
6.4%
Environmental Services
5.0%
Electronics
3.9%
Other Industry sectors
25.2%
Other Assets and Liabilities (Net)Footnote Reference*
0.0%
FootnoteDescription
Footnote*
Amount represents less than 0.05%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Madison Square Garden Sports Corp.
7.9%
The Bank of New York Mellon Corp.
7.1%
Newmont Corp.
6.7%
Sphere Entertainment Co.
5.1%
Crane Co.
4.4%
National Fuel Gas Co.
4.1%
Atlanta Braves Holdings Inc.
3.9%
Sony Group Corp.
3.9%
American Express Co.
3.6%
Republic Services Inc.
3.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
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: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address https://gabelli.com/ticker/GVCAX/
C000002904  
Shareholder Report [Line Items]  
Fund Name The Gabelli Value 25 Fund Inc.
Class Name Class C
Trading Symbol GVCCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Value 25 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, including the Fund’s prospectus, financial information, holdings, and proxy voting information, at https://gabelli.com/ticker/GVCCX/. You can also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website https://gabelli.com/ticker/GVCCX/
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Value 25 Fund Inc. - Class C
$114
2.19%
Expenses Paid, Amount $ 114
Expense Ratio, Percent 2.19%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2026, the Gabelli Value 25 Fund underperformed its benchmarks, the S&P 500 and Russell 1000 Value Indices.  Although the market remains narrow with the top ten companies representing nearly 40% of total capitalization, semiconductors drove performance (up 104%) while the Magnificent 7 was essentially flat for the first half. Financial engineering remains alive and well; worldwide deal activity hit another all-time high in the second quarter. Top contributors to performance included Madison Square Garden Sports, Sphere Entertainment, and Bank of New York Mellon. Detractors included Sony Group, American Express Corp., and Fox Corp. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
Table Summary
The Gabelli Value 25 Fund Inc. - Class C
The Gabelli Value 25 Fund Inc. - Class C (includes sales charge)
S&P 500 Index
Russell 1000 Value Index
06/16
10,000
10,000
10,000
10,000
06/17
11,215
11,215
11,790
11,553
06/18
11,794
11,794
13,484
12,335
06/19
12,193
12,193
14,889
13,379
06/20
10,425
10,425
16,007
12,196
06/21
15,103
15,103
22,537
17,523
06/22
12,356
12,356
20,143
16,328
06/23
13,069
13,069
24,090
18,212
06/24
13,795
13,795
30,006
20,591
06/25
16,794
16,794
34,555
23,412
06/26
20,929
20,929
42,268
29,761
Average Annual Return [Table Text Block]
Table Summary
6 months
1 Year
5 Year
10 Year
The Gabelli Value 25 Fund Inc. - Class C
9.28%
24.62%
6.74%
7.67%
The Gabelli Value 25 Fund Inc. - Class C (includes sales charge)
8.28%
23.62%
6.74%
7.67%
S&P 500 Index
10.21%
22.32%
13.41%
15.51%
Russell 1000 Value Index
16.26%
27.12%
11.17%
11.52%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on Fund distributions or the redemption of Fund shares.
AssetsNet $ 249,845,304
Holdings Count | Holding 86
Advisory Fees Paid, Amount $ 1,151,472
InvestmentCompanyPortfolioTurnover 9.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$249,845,304
  • Number of Portfolio Holdings86
  • Portfolio Turnover Rate9%
  • Management Fees$1,151,472
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Table Summary
Common Stocks
93.5%
U.S. Government Obligations
6.5%
Other Assets and Liabilities (Net)Footnote Reference*
0.0%
FootnoteDescription
Footnote*
Amount represents less than 0.05%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Table Summary
Industry Weighting
.
Entertainment
25.1%
Financial Services
14.2%
Metals and Mining
7.3%
U.S. Government Obligations
6.5%
Diversified Industrial
6.4%
Energy and Utilities
6.4%
Environmental Services
5.0%
Electronics
3.9%
Other Industry sectors
25.2%
Other Assets and Liabilities (Net)Footnote Reference*
0.0%
FootnoteDescription
Footnote*
Amount represents less than 0.05%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Madison Square Garden Sports Corp.
7.9%
The Bank of New York Mellon Corp.
7.1%
Newmont Corp.
6.7%
Sphere Entertainment Co.
5.1%
Crane Co.
4.4%
National Fuel Gas Co.
4.1%
Atlanta Braves Holdings Inc.
3.9%
Sony Group Corp.
3.9%
American Express Co.
3.6%
Republic Services Inc.
3.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
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: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address https://gabelli.com/ticker/GVCCX/
C000034316  
Shareholder Report [Line Items]  
Fund Name The Gabelli Value 25 Fund Inc.
Class Name Class I
Trading Symbol GVCIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Value 25 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, including the Fund’s prospectus, financial information, holdings, and proxy voting information, at https://gabelli.com/ticker/GVCIX/. You can also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website https://gabelli.com/ticker/GVCIX/
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Value 25 Fund Inc. - Class I
$52
1.00%
Expenses Paid, Amount $ 52
Expense Ratio, Percent 1.00%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2026, the Gabelli Value 25 Fund underperformed its benchmarks, the S&P 500 and Russell 1000 Value Indices.  Although the market remains narrow with the top ten companies representing nearly 40% of total capitalization, semiconductors drove performance (up 104%) while the Magnificent 7 was essentially flat for the first half. Financial engineering remains alive and well; worldwide deal activity hit another all-time high in the second quarter. Top contributors to performance included Madison Square Garden Sports, Sphere Entertainment, and Bank of New York Mellon. Detractors included Sony Group, American Express Corp., and Fox Corp. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
Table Summary
The Gabelli Value 25 Fund Inc. - Class I
S&P 500 Index
Russell 1000 Value Index
06/16
50,000
50,000
50,000
06/17
56,715
58,950
57,765
06/18
60,370
67,421
61,676
06/19
63,135
74,446
66,893
06/20
54,619
80,037
60,980
06/21
80,021
112,685
87,616
06/22
66,317
100,717
81,641
06/23
70,855
120,448
91,062
06/24
75,787
150,030
102,955
06/25
93,315
172,775
117,060
06/26
117,676
211,338
148,806
Average Annual Return [Table Text Block]
Table Summary
6 months
1 Year
5 Year
10 Year
The Gabelli Value 25 Fund Inc. - Class I
9.97%
26.11%
8.02%
8.94%
S&P 500 Index
10.21%
22.32%
13.41%
15.51%
Russell 1000 Value Index
16.26%
27.12%
11.17%
11.52%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on Fund distributions or the redemption of Fund shares.
AssetsNet $ 249,845,304
Holdings Count | Holding 86
Advisory Fees Paid, Amount $ 1,151,472
InvestmentCompanyPortfolioTurnover 9.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$249,845,304
  • Number of Portfolio Holdings86
  • Portfolio Turnover Rate9%
  • Management Fees$1,151,472
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Table Summary
Common Stocks
93.5%
U.S. Government Obligations
6.5%
Other Assets and Liabilities (Net)Footnote Reference*
0.0%
FootnoteDescription
Footnote*
Amount represents less than 0.05%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Table Summary
Industry Weighting
.
Entertainment
25.1%
Financial Services
14.2%
Metals and Mining
7.3%
U.S. Government Obligations
6.5%
Diversified Industrial
6.4%
Energy and Utilities
6.4%
Environmental Services
5.0%
Electronics
3.9%
Other Industry sectors
25.2%
Other Assets and Liabilities (Net)Footnote Reference*
0.0%
FootnoteDescription
Footnote*
Amount represents less than 0.05%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Madison Square Garden Sports Corp.
7.9%
The Bank of New York Mellon Corp.
7.1%
Newmont Corp.
6.7%
Sphere Entertainment Co.
5.1%
Crane Co.
4.4%
National Fuel Gas Co.
4.1%
Atlanta Braves Holdings Inc.
3.9%
Sony Group Corp.
3.9%
American Express Co.
3.6%
Republic Services Inc.
3.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
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: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address https://gabelli.com/ticker/GVCIX/
C000002902  
Shareholder Report [Line Items]  
Fund Name The Gabelli Value 25 Fund Inc.
Class Name Class A
Trading Symbol GABVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Value 25 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, including the Fund’s prospectus, financial information, holdings, and proxy voting information, at https://gabelli.com/ticker/GABVX/. You can also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website https://gabelli.com/ticker/GABVX/
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Value 25 Fund Inc. - Class A
$75
1.44%
Expenses Paid, Amount $ 75
Expense Ratio, Percent 1.44%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2026, the Gabelli Value 25 Fund underperformed its benchmarks, the S&P 500 and Russell 1000 Value Indices.  Although the market remains narrow with the top ten companies representing nearly 40% of total capitalization, semiconductors drove performance (up 104%) while the Magnificent 7 was essentially flat for the first half. Financial engineering remains alive and well; worldwide deal activity hit another all-time high in the second quarter. Top contributors to performance included Madison Square Garden Sports, Sphere Entertainment, and Bank of New York Mellon. Detractors included Sony Group, American Express Corp., and Fox Corp. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
Table Summary
The Gabelli Value 25 Fund Inc. - Class A
The Gabelli Value 25 Fund Inc. - Class A (includes sales charge)
S&P 500 Index
Russell 1000 Value Index
06/16
10,000
10,000
10,000
10,000
06/17
11,302
10,652
11,790
11,553
06/18
11,981
11,292
13,484
12,335
06/19
12,471
11,753
14,889
13,379
06/20
10,751
10,133
16,007
12,196
06/21
15,676
14,775
22,537
17,523
06/22
12,938
12,194
20,143
16,328
06/23
13,767
12,975
24,090
18,212
06/24
14,633
13,792
30,006
20,591
06/25
17,936
16,905
34,555
23,412
06/26
22,523
21,228
42,268
29,761
Average Annual Return [Table Text Block]
Table Summary
6 months
1 Year
5 Year
10 Year
The Gabelli Value 25 Fund Inc. - Class A
9.73%
25.57%
7.52%
8.46%
The Gabelli Value 25 Fund Inc. - Class A (includes sales charge)
3.42%
18.35%
6.25%
7.82%
S&P 500 Index
10.21%
22.32%
13.41%
15.51%
Russell 1000 Value Index
16.26%
27.12%
11.17%
11.52%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on Fund distributions or the redemption of Fund shares.
AssetsNet $ 249,845,304
Holdings Count | Holding 86
Advisory Fees Paid, Amount $ 1,151,472
InvestmentCompanyPortfolioTurnover 9.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$249,845,304
  • Number of Portfolio Holdings86
  • Portfolio Turnover Rate9%
  • Management Fees$1,151,472
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Table Summary
Common Stocks
93.5%
U.S. Government Obligations
6.5%
Other Assets and Liabilities (Net)Footnote Reference*
0.0%
FootnoteDescription
Footnote*
Amount represents less than 0.05%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Table Summary
Industry Weighting
.
Entertainment
25.1%
Financial Services
14.2%
Metals and Mining
7.3%
U.S. Government Obligations
6.5%
Diversified Industrial
6.4%
Energy and Utilities
6.4%
Environmental Services
5.0%
Electronics
3.9%
Other Industry sectors
25.2%
Other Assets and Liabilities (Net)Footnote Reference*
0.0%
FootnoteDescription
Footnote*
Amount represents less than 0.05%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Madison Square Garden Sports Corp.
7.9%
The Bank of New York Mellon Corp.
7.1%
Newmont Corp.
6.7%
Sphere Entertainment Co.
5.1%
Crane Co.
4.4%
National Fuel Gas Co.
4.1%
Atlanta Braves Holdings Inc.
3.9%
Sony Group Corp.
3.9%
American Express Co.
3.6%
Republic Services Inc.
3.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
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: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address https://gabelli.com/ticker/GABVX/