Note 2 - Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
	Aug. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
Maximum Period Of Agreement		21 years
Deferred Revenue, Total		$ 1,049,000
Deferred Revenue, Current, Total		620,000	$ 485,000
Deferred Revenue, Noncurrent, Total		1,901,000	303,000
Cash and Cash Equivalents, at Carrying Value, Ending Balance		3,157,000	2,400,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total		15,000	$ 30,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments		$ 0
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		8,367,074	6,869,441
Operating Lease, Right-of-Use Asset		$ 859,000
Operating Lease, Liability, Total		859,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset				$ 966,000
Operating Lease, Liability, Total				$ 966,000
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		324,445
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		$ 10,000	11,000
Supply Agreement [Member]
Contract with Customer, Liability, Total	$ 2,000,000
Supply Agreement, Term	5 years	7 years
Supply Agreement, Renewal Term	2 years	2 years
Proceeds from Customers		$ 2,000,000
Cord Blood Storage Revenue [Member]
Contract with Customer, Liability, Total		237,000	252,000
Contract with Customer, Liability, Current		14,000	14,000
Contract with Customer, Liability, Noncurrent		223,000	$ 238,000
Exclusivity Fee [Member]
Deferred Revenue, Total		1,904,000
Deferred Revenue, Current, Total		286,000
Deferred Revenue, Noncurrent, Total		1,618,000
Contract with Customer, Liability, Revenue Recognized		$ 96,000