Note 4 - Related Party Transactions (Details Textual)	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Mar. 24, 2022 USD ($) ft²	Mar. 04, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2017 USD ($)
Amortization of Debt Discount (Premium)	$ 213,000	$ 908,000
Interest Paid, Excluding Capitalized Interest, Operating Activities	60,000	60,000
Notes Payable, Related Parties, Current	10,000,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	14,000	1,000
Boyalife Asset Holding II [Member]
Royalty Expense	0
Lease Agreement with Z3 Investment LLC [Member]
Lessee, Operating Lease, Term of Contract (Year)			5 years
Area of Real Estate Property (Square Foot) | ft²			35,475
First Six Months, Rental Expense, Operating Leases			$ 46,000
Second Six Months, Rental Expense, Operating Lease			$ 104,000
Percent Increase, Annual Rental Expense			4.00%
ImmuneCyte [Member]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	$ 8.64
Royalty, Percent of Annual Net Sales, US Patents			7.50%
Royalty, Percent of Annual Net Sales, Other Licensed Intellectual Property			5.00%
Boyalife Asset Holding II [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 10,000,000
Long-term Line of Credit, Total					$ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage	22.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares	$ 0.64
Amortization of Debt Discount (Premium)	$ 213,000	827,000
Interest Paid, Excluding Capitalized Interest, Operating Activities	550,000	$ 550,000
Interest Payable	$ 153,000				$ 2,231,000
Notes Payable, Related Parties, Current				$ 10,000,000