v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 03, 2026
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-12957  
Entity Registrant Name Viskase Holdings, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 22-2372868  
Entity Address, Address Line One 333 East Butterfield Road, Suite 400  
Entity Address, City or Town Lombard  
Entity Address State Or Province IL  
Entity Address, Postal Zip Code 60148  
City Area Code 630  
Local Phone Number 874-0700  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   14,331,620
Entity Central Index Key 0000727510  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false