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        Taxonomy & unit
      
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        us-gaap: USD
      
      
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        Description
      
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        Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.
      
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        Summary
      
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        Main Street Capital CORP quarterly/annual Share-based Payment Arrangement, Expense history and growth rate from 2020 to 2024.- Main Street Capital CORP Share-based Payment Arrangement, Expense for the quarter ending June 30, 2025 was $5.42M, a 10.9% increase year-over-year.
- Main Street Capital CORP Share-based Payment Arrangement, Expense for the twelve months ending June 30, 2025 was $20.1M, a 15.9% increase year-over-year.
- Main Street Capital CORP annual Share-based Payment Arrangement, Expense for 2024 was $18.8M, a 13.8% increase from 2023.
- Main Street Capital CORP annual Share-based Payment Arrangement, Expense for 2023 was $16.5M, a 21.2% increase from 2022.
- Main Street Capital CORP annual Share-based Payment Arrangement, Expense for 2022 was $13.6M, a 25.2% increase from 2021.
 
 
 
    
  Share-based Payment Arrangement, Expense, Trailing 12 Months (USD)
  
  
  Share-based Payment Arrangement, Expense, Annual (USD)
  
    
  Share-based Payment Arrangement, Expense, YoY Annual Growth (%)