Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Apr. 09, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	000-16375
Entity Registrant Name	THERMOGENESIS HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3018487
Entity Address, Address Line One	2711 Citrus Road
Entity Address, City or Town	Rancho Cordova
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95742
City Area Code	916
Local Phone Number	858-5100
Title of 12(b) Security	Common Stock, $.001 par value
Trading Symbol	THMO
Security Exchange Name	NASDAQ
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			$ 2,827,985
Entity Common Stock, Shares Outstanding (in shares)		7,952,780
Auditor Firm ID	688
Auditor Name	Marcum LLP
Auditor Location	New York, NY
Entity Central Index Key	0000811212
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false