Note 6 - Related Party Transactions (Details Textual) - USD ($)			1 Months Ended	3 Months Ended		10 Months Ended	12 Months Ended
	Apr. 28, 2020	Feb. 29, 2020	Feb. 29, 2020	Mar. 17, 2021	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Mar. 16, 2021	Nov. 26, 2019	Dec. 31, 2018	Apr. 16, 2018	Mar. 31, 2017
Income (Loss) from Equity Method Investments, Total							$ (13,000)	$ (15,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total							(16,811,000)	(10,099,000)
Assets, Current, Total							15,298,000	9,521,000
Liabilities, Current, Total							6,143,000	6,685,000
Interest Paid, Excluding Capitalized Interest, Operating Activities							2,379,000	177,000
Amortization of Debt Discount (Premium)							5,558,000	2,349,000
Revenue from Related Parties							39,000	887,000
Conversion of Related Party Convertible Promissory Note Into Common Stock [Member]
Debt Conversion, Original Debt, Amount			$ 3,000,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)			1,666,670
Boyalife Investment Fund II, Inc. [Member] | Convertible Debt [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)											$ 1.80	$ 16.10
Boyalife Investment Fund II, Inc. [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity													$ 10,000,000
Proceeds from Long-term Lines of Credit	$ 2,418,000		$ 1,869,000
Amortization of Accelerated Debt Discount Due to Conversion			$ 2,486,000
Long-term Line of Credit, Total	$ 10,000,000						$ 10,000,000	8,713,000
Debt Instrument, Interest Rate, Stated Percentage							22.00%
Debt Instrument, Convertible, Beneficial Conversion Feature		$ 1,869,000
Amortization of Debt Discount (Premium)							$ 2,931,000	2,344,000
Interest Expense, Debt, Excluding Amortization							2,082,000	1,869,000
Interest Payable							2,082,000	1,869,000
Boyalife Investment Fund II, Inc. [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Interest Paid, Excluding Capitalized Interest, Operating Activities				$ 2,082,000
Boyalife W.S.N. [Member]
Revenue from Related Parties							14,000	794,000
Accounts Receivable, Related Parties							10,000	20,000
COVID-19 Testing Kits [Member]
Inventory Write-down							2,800,000
COVID-19 Testing Kits [Member] | ImmuneCyte [Member]
Related Party Transaction, Purchases from Related Party							$ 3,600,000
Refund from Related Party Purchases					$ 800,000
ImmuneCyte [Member]
Proceeds from Issuance of Common Stock						$ 3,700,000
ImmuneCyte [Member] | Common Class A [Member]
Stock Issued During Period, Shares, New Issues (in shares)						643,750
ImmuneCyte [Member] | Common Class A [Member] | Minimum [Member]
Shares Issued, Price Per Share (in dollars per share)					$ 5	$ 5
ImmuneCyte [Member] | Common Class A [Member] | Maximum [Member]
Shares Issued, Price Per Share (in dollars per share)					$ 16	$ 16
ImmuneCyte [Member]
Equity Method Investment, Ownership Percentage					18.79%	18.79%	18.79%			20.00%
Joint Venture Purchase, Percent of Company's Cost										115.00%
Line of Credit Facility, Maximum Borrowing Capacity										$ 1,000,000
Equity Method Investment, Aggregate Cost							$ 0			$ 28,000
Income (Loss) from Equity Method Investments, Total							13,000	$ 15,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total							2,142,000
Assets, Current, Total							1,505,000
Liabilities, Current, Total							$ 410,000
ImmuneCyte [Member] | Subsequent Event [Member]
Equity Method Investment, Ownership Percentage				8.80%					18.79%
ImmuneCyte [Member] | HealthBanks Biotech [Member]
Equity Method Investment, Ownership Percentage					75.16%	75.16%				80.00%
ImmuneCyte [Member] | Private Institution [Member]
Equity Method Investment, Ownership Percentage					6.05%	6.05%