Automatic shelf registration statement on Form N-2 for well-known seasoned issuers

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v3.25.0.1
Cover
Feb. 28, 2025
Document Information [Line Items]  
Document Type N-2
Document Registration Statement true
Pre-Effective Amendment false
Post-Effective Amendment false
Dividend or Interest Reinvestment Plan Only false
Delayed or Continuous Offering true
Effective Upon Filing, 462(e) true
Additional Securities Effective, 413(b) false
Effective when Declared, Section 8(c) false
New Effective Date for Previous Filing false
Additional Securities. 462(b) false
No Substantive Changes, 462(c) false
Exhibits Only, 462(d) false
Approximate Date of Commencement of Proposed Sale to Public From time to time after the effective date of this Registration Statement.
Amendment Flag false
Entity Information [Line Items]  
Entity Registrant Name Main Street Capital Corporation
Entity Central Index Key 0001396440
Securities Act File Number 333-000000
Entity Well-known Seasoned Issuer Yes
Entity Emerging Growth Company false
Entity Inv Company Type N-2
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One 1300 Post Oak Boulevard,
Entity Address, Address Line Two 8th Floor
Entity Address, City or Town Houston,
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77056
Entity Phone Fax Numbers [Line Items]  
City Area Code 713
Local Phone Number 350-6000
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name Dwayne L. Hyzak
Entity Address, Address Line One 1300 Post Oak Boulevard
Entity Address, Address Line Two 8th Floor
Entity Address, City or Town Houston
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77056