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N-2 - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Prospectus [Line Items]            
Document Period End Date   Dec. 31, 2024        
Cover [Abstract]            
Entity Central Index Key   0000813623        
Amendment Flag   false        
Document Type   N-CSR        
Entity Registrant Name   The Swiss Helvetia Fund, Inc.        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]            
Capital Stock [Table Text Block]  
Note 4—Capital Share Transactions
The Fund is authorized to issue up to 50 million shares of capital stock. Transactions in capital shares were as follows:

   
For the Year Ended
    
For the Year Ended
  
   
December 31, 2024
    
December 31, 2023
  
   
Shares
    
Amount
    
Shares
    
Amount
  
Dividends Reinvested
    
—
    
$
—
      
—
    
$
—
  
Repurchased through Stock Repurchase Program (Note 6)
    
—
      
—
      
(205,045
)
    
(1,687,724
)
Repurchased from Tender Offer
    
—
      
—
      
—
      
—
  
Net Increase/(Decrease)
    
—
    
$
—
      
(205,045
)
  
$
(1,687,724
)
       
Common Stock [Member]            
General Description of Registrant [Abstract]            
Share Price $ 7.49 $ 7.49 $ 8.20 $ 7.56 $ 9.94 $ 8.94
NAV Per Share $ 8.94 $ 8.94 $ 9.76 $ 8.80 $ 11.50 $ 10.45
Capital Stock, Long-Term Debt, and Other Securities [Abstract]            
Outstanding Security, Authorized [Shares] 50,000,000          
Outstanding Security, Not Held [Shares] 12,990,705