XML 8 R1.htm IDEA: XBRL DOCUMENT v3.25.0.1
Document and Entity Information - shares
shares in Millions
 9 Months Ended
Dec. 31, 2024
Feb. 10, 2025
Cover [Abstract]    
Entity Registrant Name OLD MARKET CAPITAL CORPORATION  
Entity Central Index Key 0001000045  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --03-31  
Entity Filer Category Non-accelerated Filer  
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Dec. 31, 2024  
Amendment Flag false  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q3  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity File Number 0-26680  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 59-2506879  
Entity Address, Address Line One 1601 Dodge St.  
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  
City Area Code 402  
Local Phone Number 658-0809  
Title of 12(b) Security Common Stock  
Trading Symbol OMCC  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   6.7