v3.25.2
Cover
Aug. 11, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 11, 2025
Entity File Number 001-41472
Entity Registrant Name MILL CITY VENTURES III, LTD.
Entity Central Index Key 0001425355
Entity Tax Identification Number 90-0316651
Entity Incorporation, State or Country Code MN
Entity Address, Address Line One 1907 Wayzata Boulevard
Entity Address, Address Line Two Suite 205
Entity Address, City or Town Wayzata
Entity Address, State or Province MN
Entity Address, Postal Zip Code 55391
City Area Code 952
Local Phone Number 479-1923
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.001 per share
Trading Symbol MCVT
Security Exchange Name NASDAQ
Entity Emerging Growth Company false