Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Schedule of Restricted Stock Authorized and Available for Issuance (Details)

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SHARE-BASED COMPENSATION - Schedule of Restricted Stock Authorized and Available for Issuance (Details) - Restricted Stock
3 Months Ended
Mar. 31, 2024
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Less net restricted stock granted (in shares) (5,043)
Main Street Capital Corporation 2022 Equity and Incentive Plan  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Restricted stock authorized under the plan (in shares) 5,000,000
Less net restricted stock granted (in shares) (559,998)
Restricted stock available for issuance (in shares) 4,440,002
Main Street Capital Corporation 2022 Non-Employee Director Restricted Stock Plan | Director  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Restricted stock authorized under the plan (in shares) 300,000
Less net restricted stock granted (in shares) (7,525)
Restricted stock available for issuance (in shares) 292,475