Note 2 - Summary of Significant Accounting Policies (Details Textual)	6 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) shares	Dec. 31, 2018 USD ($) shares	Jun. 30, 2017 USD ($) shares	Jan. 01, 2018 USD ($)
Maximum Period Of Agreement		21 years
Contract with Customer, Liability, Revenue Recognized		$ 384,000
Contract with Customer, Liability, Current	$ 384,000	485,000
Contract with Customer, Liability, Noncurrent	331,000	303,000
Cash and Cash Equivalents, at Carrying Value, Ending Balance	3,513,000	2,400,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	$ (5,000)	$ 30,000	$ (1,000)
Number of Reportable Segments		2
Income Tax Examination, Penalties and Interest Accrued, Total		$ 0
Unrecognized Tax Benefits, Ending Balance		$ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares	5,985,166	68,694,403	5,285,805
Retained Earnings [Member]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (79,000)
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares		2,965,000
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life		3 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life		10 years
INDIA
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 71,000	$ 11,000
Cord Blood Storage Revenue [Member]
Contract with Customer, Liability, Revenue Recognized		$ 257,000