Note 4 - Related Party Transactions (Details Textual) - USD ($)		1 Months Ended	3 Months Ended				6 Months Ended
	Mar. 24, 2022	Jun. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Feb. 28, 2022	Dec. 31, 2021	Mar. 31, 2017
Amortization of Debt Discount (Premium)							$ 955,000	$ 1,815,000
Interest Paid, Excluding Capitalized Interest, Operating Activities							120,000	120,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total			$ 31,000	$ 14,000	$ 12,000	$ 1,000	45,000	13,000
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%
Convertible Note Converted into Common Stock [Member]
Debt Conversion, Original Debt, Amount		$ 3,000,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)		10,552,234
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		$ 7,000,000	$ 7,000,000				$ 7,000,000
Debt Instrument, Interest Rate, Stated Percentage		22.00%	22.00%				22.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share)		$ 0.28	$ 0.28				$ 0.28		$ 0.64
Debt Instrument, Unamortized Discount, Total		$ 2,475,000	$ 2,475,000				$ 2,475,000
Amortization of Debt Discount (Premium)			742,000				955,000
Interest Paid, Excluding Capitalized Interest, Operating Activities			556,000		$ 1,106,000		556,000	$ 1,106,000
Interest Payable		$ 709,000	$ 709,000				$ 709,000			$ 2,231,000