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Document and Entity Information
Feb. 14, 2025
Feb. 12, 2025
Cover [Abstract]    
Document Type   8-K
Amendment Flag   false
Document Period End Date Feb. 14, 2025  
Entity Registrant Name   OLD MARKET CAPITAL CORPORATION
Entity Central Index Key   0001000045
Entity Incorporation, State or Country Code   DE
Securities Act File Number   0-26680
Entity Tax Identification Number   59-2506879
Entity Address, Address Line One   1601 Dodge Street
Entity Address, Address Line Two   Suite 3350
Entity Address, City or Town   Omaha
Entity Address, State or Province   NE
Entity Address, Postal Zip Code   68102
Local Phone Number   -0809
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Title of 12(b) Security   Common Stock
Trading Symbol   OMCC
Security Exchange Name   NASDAQ
Entity Emerging Growth Company   false