{"cik":2065708,"taxonomy":"us-gaap","tag":"RetainedEarningsAccumulatedDeficit","label":"Retained Earnings (Accumulated Deficit)","description":"The cumulative amount of the reporting entity's undistributed earnings or deficit.","entityName":"Andersen Group Inc.","units":{"USD":[{"end":"2025-12-31","val":-134742000,"accn":"0001193125-26-128949","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-27"},{"end":"2025-12-31","val":-134742000,"accn":"0001193125-26-219544","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-12","frame":"CY2025Q4I"},{"end":"2026-03-31","val":-780501000,"accn":"0001193125-26-219544","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-12","frame":"CY2026Q1I"}]}}