Note 10 - Subsequent Events (Details Textual) - $ / shares	Jul. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Jan. 31, 2023	Dec. 31, 2022
Revolving Credit Facility [Member] | Boyalife Asset Holding II [Member]
Debt Instrument, Convertible, Conversion Price		$ 2.65		$ 6.30	$ 6.30
Subsequent Event [Member] | Revolving Credit Facility [Member] | Boyalife Asset Holding II [Member]
Debt Instrument, Convertible, Conversion Price	$ 1.07
The July 2019 Note [Member] | Convertible Debt [Member]
Debt Instrument, Convertible, Conversion Price		$ 2.65	$ 2.65	$ 2.87	$ 6.30
The July 2019 Note [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Debt Instrument, Convertible, Conversion Price	1.07
Conversion Price Adjustment. Minimum Effective Price Benchmark	$ 1.07