Note 4 - Acquisitions - Acquired Intangible Assets and Related Estimated Useful Lives (Details) - USD ($) $ in Thousands				9 Months Ended
	Jun. 22, 2020	Oct. 11, 2019	Sep. 20, 2018	Sep. 30, 2021
Artegraft Inc [Member]
Allocated Fair Value	$ 39,056
Weighted Average Useful Life (Year)	12 years 7 months 6 days
Artegraft Inc [Member] | Customer Relationships [Member]
Allocated Fair Value	$ 20,310
Weighted Average Useful Life (Year)	15 years
Artegraft Inc [Member] | Intellectual Property [Member]
Allocated Fair Value	$ 16,449
Weighted Average Useful Life (Year)	10 years
Artegraft Inc [Member] | Noncompete Agreements [Member]
Allocated Fair Value	$ 104
Weighted Average Useful Life (Year)	5 years
Artegraft Inc [Member] | Trade Names [Member]
Allocated Fair Value	$ 2,193
Weighted Average Useful Life (Year)	10 years
CardioCel and VascuCel Biologic Patches [Member]
Allocated Fair Value		$ 8,725
Weighted Average Useful Life (Year)				10 years 4 months 24 days
CardioCel and VascuCel Biologic Patches [Member] | Customer Relationships [Member]
Allocated Fair Value		$ 5,562
Weighted Average Useful Life (Year)		12 years
CardioCel and VascuCel Biologic Patches [Member] | Intellectual Property [Member]
Allocated Fair Value		$ 2,335
Weighted Average Useful Life (Year)		8 years
CardioCel and VascuCel Biologic Patches [Member] | Noncompete Agreements [Member]
Allocated Fair Value		$ 361
Weighted Average Useful Life (Year)		5 years
CardioCel and VascuCel Biologic Patches [Member] | Trade Names [Member]
Allocated Fair Value		$ 467
Weighted Average Useful Life (Year)		8 years
Applied Medical [Member]
Allocated Fair Value			$ 4,844
Applied Medical [Member] | Customer Relationships [Member]
Allocated Fair Value			$ 3,945
Weighted Average Useful Life (Year)			13 years
Applied Medical [Member] | Intellectual Property [Member]
Allocated Fair Value			$ 563
Weighted Average Useful Life (Year)			7 years
Applied Medical [Member] | Noncompete Agreements [Member]
Allocated Fair Value			$ 233
Weighted Average Useful Life (Year)			5 years
Applied Medical [Member] | Trade Names [Member]
Allocated Fair Value			$ 103
Weighted Average Useful Life (Year)			7 years