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Note 1 - Organization and Significant Accounting Policies (Details Textual)		6 Months Ended	12 Months Ended
	Apr. 20, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Nov. 30, 2020 USD ($)	Oct. 01, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Number of Reportable Segments			1
Number of Operating Segments			1
Impairment of Intangible Assets (Excluding Goodwill), Total		$ 0
Business Combination, Contingent Consideration, Liability, Total		$ 388,000	$ 221,000
Deferred Tax Payments, Social Security			$ 432,000
Deferred Social Security Tax Payments Payback, Percentage Tranche One			50.00%
Deferred Social Security Tax Payments Payback, Percentage Tranche Two			50.00%
Impairment Loss Recognized During Period			$ 0	$ 0
Operating Lease, Right-of-Use Asset			9,675,000	1,040,000				$ 1,300,000
Operating Lease, Liability, Total			9,864,000					1,800,000
Unrecognized Tax Benefits, Ending Balance			96,000	0					$ 0
Advertising Expense			$ 167,000	$ 43,000
Number of Reporting Units			1
Goodwill, Impairment Loss			$ 0
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage			13.00%	15.00%
Number of Major Customers			1	1
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| CryoStor Products [Member]
Concentration Risk, Percentage			60.00%	74.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage			17.00%	25.00%
Number of Major Customers			1	2
Supplier Concentration Risk [Member] \| Revenue Benchmark [Member]
Number of Suppliers				1
Supplier Concentration Risk [Member] \| Revenue Benchmark [Member] \| One Supplier [Member]
Concentration Risk, Percentage				12.00%
Supplier Concentration Risk [Member] \| Accounts Payable [Member]
Number of Suppliers			1	2
Supplier Concentration Risk [Member] \| Accounts Payable [Member] \| One Supplier [Member]
Concentration Risk, Percentage			21.00%
Supplier Concentration Risk [Member] \| Accounts Payable [Member] \| Two Suppliers [Member]
Concentration Risk, Percentage				24.00%
Assets Held for Rent [Member]
Property, Plant and Equipment, Useful Life (Year)			3 years
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)			3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)			10 years
Contingent 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
Contingent Convertible Preferred Stock [Member] \| Series A-1 and A-2, Preferred Stock [Member]
Equity Securities without Readily Determinable Fair Value, Amount			$ 3,400,000
Contingent Convertible Preferred Stock [Member] \| Series E Preferred Stock [Member]
Equity Securities without Readily Determinable Fair Value, Amount			995,000
Contingent Convertible Preferred Stock [Member] \| Series A-2 Preferred Stock [Member]
Equity Securities without Readily Determinable Fair Value, Amount					$ 1,000,000.0
Contingent Convertible Preferred Stock [Member] \| Preferred Stock, Class E [Member]
Contingent Milestone Payment			2,000,000
Convertible Debt Securities [Member]
Debt Securities, Available-for-sale, Amortized Cost, Total							$ 1,000,000.0
Debt Securities, Gain (Loss), Total			1,300,000	$ 0
SciSafe Holdings, Inc [Member]
Business Combination, Contingent Consideration, Liability, Total			6,900,000			$ 3,700,000
Operating Lease, Right-of-Use Asset								$ 1,300,000
Sexton Biotechnologies [Member] \| Contingent Convertible Preferred Stock [Member]
Equity Securities without Readily Determinable Fair Value, Amount				1,500,000
PanTHERA Cryosolutions Investment [Member] \| Contingent Convertible Preferred Stock [Member] \| Preferred Stock, Class E [Member]
Equity Securities without Readily Determinable Fair Value, Amount					$ 995,000
Paycheck Protection Program CARES Act [Member]
Repayments of Debt	$ 2,175,320		$ 2,175,000	$ (0)
Debt Instrument, Interest Rate, Stated Percentage			1.00%
Paycheck Protection Program CARES Act [Member] \| SciSafe Holdings, Inc [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt						$ 295,300
Debt Instrument, Interest Rate, Stated Percentage						1.00%