v3.26.1
Document and Entity Information
Jun. 16, 2026
Cover [Abstract]  
Entity Central Index Key 0001471420
Amendment Flag false
Document Type 8-K
Document Period End Date Jun. 16, 2026
Entity Registrant Name Columbia Seligman Premium Technology Growth Fund, Inc.
Entity Incorporation State Country Code MD
Entity File Number 811-22328
Entity Tax Identification Number 20-0994125
Entity Address, Address Line One 290 Congress Street
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02210
City Area Code 800
Local Phone Number 937-5449
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock
Trading Symbol STK
Security Exchange Name NYSE
Entity Emerging Growth Company false