Cover - USD ($)	12 Months Ended
	Dec. 31, 2025	Mar. 20, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40261
Entity Registrant Name	Soluna Holdings, Inc.
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	14-1462255
Entity Address, Address Line One	325 Washington Avenue Extension
Entity Address, City or Town	Albany
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	12205
City Area Code	(516)
Local Phone Number	216-9257
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 8,284,532
Entity Common Stock, Shares Outstanding		111,381,064
Documents Incorporated by Reference	None
Entity Central Index Key	0000064463
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock, par value $0.001 per share
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	SLNH
Security Exchange Name	NASDAQ
9.0% Series A Cumulative Perpetual Preferred Stock, par value $0.001 per share
Document Information [Line Items]
Title of 12(b) Security	9.0% Series A Cumulative Perpetual Preferred Stock, par value $0.001 per share
Trading Symbol	SLNHP
Security Exchange Name	NASDAQ