Note 1 - Description of Business and Basis of Presentation (Details Textual)					3 Months Ended	12 Months Ended
	Jul. 07, 2017 USD ($)	Aug. 22, 2016 USD ($) shares	Aug. 03, 2016 USD ($) $ / shares shares	Mar. 04, 2016 shares	Sep. 20, 2017 USD ($)	Jun. 30, 2017 USD ($) shares	Jun. 30, 2016 USD ($) shares	Sep. 13, 2017 USD ($)	Mar. 06, 2017 USD ($)	Jun. 30, 2015 USD ($)
Common Stock, Shares Authorized | shares				350,000,000		350,000,000	350,000,000
Debt Conversion, Original Debt, Amount		$ 23,903,000
Debt Conversion, Converted Instrument, Shares Issued | shares		6,102,941
Stock Issued During Period, Shares, New Issues | shares			600,000
Shares Issued, Price Per Share | $ / shares			$ 4.10
Proceeds from Issuance of Common Stock			$ 2,092,000			$ 2,092,000	$ 2,463,000
Cash and Cash Equivalents, at Carrying Value						3,623,000	5,835,000			$ 3,357,000
Working Capital						6,658,000
Retained Earnings (Accumulated Deficit)						(185,357,000)	$ (156,262,000)
Boyalife Investment Fund II, Inc. [Member] | Revolving Credit Facility [Member]
Long-term Line of Credit						$ 3,500,000
Line of Credit Facility, Maximum Borrowing Capacity									$ 5,000,000
Subsequent Event [Member] | Boyalife Investment Fund II, Inc. [Member] | Revolving Credit Facility [Member]
Proceeds from Lines of Credit					$ 1,500,000
Line of Credit Facility, Maximum Borrowing Capacity								$ 10,000,000
ThermoGenesis [Member] | SynGen [Member] | Subsequent Event [Member]
Percentage Of Common Stock Issued To Acquiree Shareholders	20.00%
Payments to Acquire Businesses, Gross	$ 1,000,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio				20