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Note 3 - Acquisition of SynGen - Preliminary Allocation of Consideration Transferred to Net Assets Acquired (Details) - USD ($)		6 Months Ended	12 Months Ended
	Jul. 07, 2017	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Cash		$ 1,000,000
Goodwill		$ 13,976,000	$ 13,195,000	$ 13,195,000
SynGen [Member]
Cash	$ 1,000,000
2,000,000 common shares of ThermoGenesis	2,528,000
Inventories	649,000
Finite-lived intangible assets	1,528,000
Equipment	585,000
Total assets	2,762,000
Other liabilities	15,000
Net assets acquired	(2,747,000)
Goodwill	781,000
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	1,143,000
SynGen [Member] \| Customer Relationships [Member]
Finite-lived intangible assets	$ 41,000