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Consolidated Statements of Operations (Unaudited) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jan. 16, 2022
Mar. 31, 2022
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Operating income (loss):                    
Unrealized gain (loss) on investment securities, net (from our licensed broker dealer) (Note 2)     $ (786,906)     $ 16,072     $ 696,965 $ (3,836)
Realized loss on investment securities, net (from our licensed broker dealer)             (7)
Fee income             4,233,120
Other operating income     11,502     57,903     140,873 107,356
Total operating income (loss), net     (775,404)     73,975     5,070,958 103,513
General and administrative costs:                    
Compensation     1,337,771     1,130,256     3,183,515 2,219,954
Operating expense, related party     273,821     514,798     829,474 882,601
Professional fees     459,585     51,035     1,241,089 652,713
Information technology     93,326     93,465     408,875 207,944
Clearing and other charges     3,316     2,547     382,994 22,342
General and administrative-other     327,896     406,536     883,233 1,024,761
Total general and administrative costs     2,495,715     2,198,637     6,929,180 5,010,315
Research and development costs, net of grants amounting to $743,320 and $645,731, for the three months ended September 30 and $2,265,408 and $1,651,661, for the nine months ended September 30     27,936     103,633     67,095 295,779
Total operating costs     2,523,651     2,302,270     6,996,275 5,306,094
Net operating loss     (3,299,055)     (2,228,295)     (1,925,317) (5,202,581)
Other income:                    
Interest income     176,300         548,479
Net loss before income taxes     (3,122,755)     (2,228,295)     (1,376,838) (5,202,581)
Income taxes     63,559         384,143
Net loss $ (209,182) $ (1,078,704) (3,186,314) $ 3,393,274 $ (1,967,941) (2,228,295) $ (1,686,400)   (1,760,981) (5,202,581)
Less net loss attributable to non-controlling interests     (177,853)     (144,715)     (341,631) (418,677)
Net loss attributable to MDB Capital Holdings, LLC     $ (3,008,461)     $ (2,083,580)     $ (1,419,350) $ (4,783,904)
Common Class A [Member]                    
Net loss per share attributable to MDB Capital Holdings, LLC:                    
Net loss per Class B common share - basic     $ (0.49)     $ (0.27) $ (0.73) $ (2.25) $ (0.24) $ (1.43)
Net loss per Class B common share - diluted     $ (0.49)     $ (0.27) $ (0.73) $ (2.25) $ (0.24) $ (1.43)
Weighted average of Class A common shares outstanding - basic     2,828,241     2,628,966 738,343 412,648 2,696,121 1,154,420
Weighted average of Class A common shares outstanding - diluted     2,828,241     2,628,966 738,343 412,648 2,696,121 1,154,420
Common Class B [Member]                    
Net loss per share attributable to MDB Capital Holdings, LLC:                    
Net loss per Class B common share - basic     $ (0.32)     $ (0.27)     $ (0.15) $ (0.63)
Net loss per Class B common share - diluted     $ (0.32)     $ (0.27)     $ (0.15) $ (0.63)
Weighted average of Class A common shares outstanding - basic     5,000,000     5,000,000     5,000,000 5,000,000
Weighted average of Class A common shares outstanding - diluted     5,000,000     5,000,000     5,000,000 5,000,000