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Note 3 - Acquisition of SynGen - Preliminary Allocation of Consideration Transferred to Net Assets Acquired (Details) - USD ($)		3 Months Ended
	Jul. 07, 2017	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Cash		$ 1,000,000
Preliminary goodwill		$ 13,794,000		$ 13,195,000
SynGen [Member]
Cash	$ 1,000,000
2,000,000 common shares of ThermoGenesis	2,499,000
Inventories	649,000
Finite-lived intangible assets	1,681,000
Property and equipment	585,000
Total assets	2,915,000
Other liabilities	15,000
Net assets acquired	(2,900,000)
Preliminary goodwill	599,000
SynGen [Member] \| Developed Technology Rights [Member]
Finite-lived intangible assets	318,000
SynGen [Member] \| Trade Names [Member]
Finite-lived intangible assets	26,000
SynGen [Member] \| In Process Research and Development [Member]
Finite-lived intangible assets	1,296,000
SynGen [Member] \| Customer Relationships [Member]
Finite-lived intangible assets	$ 41,000