Note 2 - Acquisitions and Divestitures - Acquired Intangible Assets and Related Estimated Useful Lives (Details) € in Thousands, $ in Thousands						12 Months Ended
	Jun. 22, 2020 USD ($)	Oct. 11, 2019 USD ($)	Jul. 12, 2019 USD ($)	Oct. 22, 2018 EUR (€)	Sep. 20, 2018 USD ($)	Dec. 31, 2020
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
Tru-Incise Valve Cutter [Member]
Allocated Fair Value			$ 4,844
Weighted Average Useful Life (Year)			11 years 9 months 18 days
Tru-Incise Valve Cutter [Member] \| Customer Relationships [Member]
Allocated Fair Value			$ 3,945
Weighted Average Useful Life (Year)			13 years
Tru-Incise Valve Cutter [Member] \| Intellectual Property [Member]
Allocated Fair Value			$ 563
Weighted Average Useful Life (Year)			7 years
Tru-Incise Valve Cutter [Member] \| Noncompete Agreements [Member]
Allocated Fair Value			$ 233
Weighted Average Useful Life (Year)			5 years
Tru-Incise Valve Cutter [Member] \| Trade Names [Member]
Allocated Fair Value			$ 103
Weighted Average Useful Life (Year)			7 years
Cardial [Member]
Allocated Fair Value \| €				€ 623
Weighted Average Useful Life (Year)				9 years 4 months 24 days
Cardial [Member] \| Customer Relationships [Member]
Allocated Fair Value \| €				€ 250
Weighted Average Useful Life (Year)				16 years
Cardial [Member] \| Intellectual Property [Member]
Allocated Fair Value \| €				€ 237
Weighted Average Useful Life (Year)				5 years
Cardial [Member] \| Noncompete Agreements [Member]
Allocated Fair Value \| €				€ 46
Weighted Average Useful Life (Year)				5 years
Cardial [Member] \| Trade Names [Member]
Allocated Fair Value \| €				€ 90
Weighted Average Useful Life (Year)				5 years
Applied Medical [Member]
Allocated Fair Value					$ 6,527
Weighted Average Useful Life (Year)					13 years
Applied Medical [Member] \| Customer Relationships [Member]
Allocated Fair Value					$ 4,475
Weighted Average Useful Life (Year)					16 years
Applied Medical [Member] \| Intellectual Property [Member]
Allocated Fair Value					$ 1,316
Weighted Average Useful Life (Year)					7 years
Applied Medical [Member] \| Noncompete Agreements [Member]
Allocated Fair Value					$ 530
Weighted Average Useful Life (Year)					5 years
Applied Medical [Member] \| Trade Names [Member]
Allocated Fair Value					$ 206
Weighted Average Useful Life (Year)					7 years