Note 1 - Organization and Significant Accounting Policies (Details Textual)				1 Months Ended	3 Months Ended								6 Months Ended			7 Months Ended	9 Months Ended		12 Months Ended
	Nov. 12, 2019 USD ($)	Aug. 08, 2019 shares	Apr. 01, 2019 USD ($) shares	Nov. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 30, 2018 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Aug. 07, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2017 USD ($)
Cash and Cash Equivalents, at Carrying Value, Ending Balance					$ 21,205,000	$ 19,617,000	$ 31,824,000	$ 31,824,000	$ 32,381,000	$ 14,167,000	$ 7,033,000	$ 7,033,000		$ 19,617,000	$ 14,167,000		$ 21,205,000	$ 32,381,000	$ 6,448,000	$ 30,657,000		$ 6,663,000
Net Income (Loss) Attributable to Parent, Total					10,269,000	$ 4,252,000	$ (19,161,000)	$ (19,161,000)	$ (24,465,000)	$ (26,346,000)	$ 4,873,000	$ 4,873,000		$ (14,909,000)	$ (21,472,000)		(4,640,000)	$ (45,938,000)	(1,657,000)	(25,005,000)
Impairment Loss Recognized During Period																			0	0
Operating Lease, Right-of-Use Asset					$ 1,177,000												$ 1,177,000		1,040,000		$ 1,300,000
Operating Lease, Liability, Total																			1,354,000		$ 1,800,000
Deferred Rent Credit																				479,000
Liability for Uncertainty in Income Taxes, Current																			0
Advertising Expense																			$ 43,000	$ 30,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage																			15.00%	29.00%
Number of Major Customers																			1	2
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage																			25.00%	71.00%
Number of Major Customers																			2	3
Product Concentration Risk [Member] | Revenue Benchmark [Member] | CryoStor Products [Member]
Concentration Risk, Percentage																			74.00%	88.00%
SAVSU [Member]
Net Income (Loss) Attributable to Parent, Total																$ 1,700,000				$ 1,900,000
Convertible Preferred Stock [Member]
Equity Securities without Readily Determinable Fair Value, Amount																			$ 1,500,000
Equity Securities without Readily Determinable Fair Value, Conversion Price Per Share (in dollars per share) | $ / shares																			$ 0.33
Convertible Debt Securities [Member]
Debt Securities, Available-for-sale, Amortized Cost, Total																			$ 1,000,000
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)																			10 years
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)																			3 years
Astero [Member]
Payments to Acquire Businesses, Gross			$ 12,521,000
Business Combination, Contingent Consideration, Asset, Total			8,500,000
Astero [Member] | Forecast [Member]
Business Combination, Earnout Payment													$ 484,000
Astero [Member] | Maximum [Member]
Business Combination, Contingent Consideration, Asset, Total			$ 8,500,000
SAVSU [Member]
Business Combinations, Number of Shares Acquired (in shares) | shares		1,100,000	1,100,000
Stock Issued During Period, Value, Acquisitions																			$ 23,932,000
CBS Acquisition [Member]
Payments to Acquire Businesses, Gross	$ 11,000,000			$ 11,000,000
Business Combination, Contingent Consideration, Asset, Total	15,000,000
Stock Issued During Period, Value, Acquisitions	$ 4,000,000