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N-2
Mar. 03, 2023
Cover [Abstract]  
Entity Central Index Key 0000806628
Amendment Flag false
Securities Act File Number 333-270256
Investment Company Act File Number 811-04915
Document Type N-2
Document Registration Statement true
Pre-Effective Amendment false
Post-Effective Amendment true
Post-Effective Amendment Number 1
Investment Company Act Registration true
Investment Company Registration Amendment true
Investment Company Registration Amendment Number 71
Entity Registrant Name DNP Select Income Fund Inc
Entity Address, Address Line One 200 South Wacker Drive
Entity Address, Address Line Two Suite 500
Entity Address, City or Town Chicago
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60606
City Area Code 312
Local Phone Number 263-2610
Approximate Date of Commencement of Proposed Sale to Public From time to time after the effective date of this Registration Statement.
Dividend or Interest Reinvestment Plan Only false
Delayed or Continuous Offering true
Primary Shelf [Flag] true
Effective Upon Filing, 462(e) false
Additional Securities Effective, 413(b) false
Effective when Declared, Section 8(c) false
Effective upon Filing, 486(b) false
New Effective Date for Previous Filing false
Additional Securities. 462(b) false
No Substantive Changes, 462(c) false
Exhibits Only, 462(d) true
Exhibits Only, 462(d), File Number 333-270256
Registered Closed-End Fund [Flag] true
Business Development Company [Flag] false
Interval Fund [Flag] false
Primary Shelf Qualified [Flag] false
Entity Well-known Seasoned Issuer No
Entity Emerging Growth Company false
New CEF or BDC Registrant [Flag] false
Business Contact [Member]  
Cover [Abstract]  
Entity Address, Address Line One 71 South Wacker Drive
Entity Address, City or Town Chicago
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60606
Contact Personnel Name Lawrence R. Hamilton, Esq.