v3.25.2
Cover
Jul. 18, 2025
Cover [Abstract]  
Entity Registrant Name MILL CITY VENTURES III, LTD.
Entity Central Index Key 0001425355
Document Type 8-K
Amendment Flag false
Entity Emerging Growth Company false
Document Period End Date Jul. 18, 2025
Entity File Number 001-41472
Entity Incorporation State Country Code MN
Entity Tax Identification Number 90-0316651
Entity Address Address Line 1 1907 Wayzata Boulevard
Entity Address Address Line 2 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