Note 2 - Acquisitions and Divestitures - Acquired Intangible Assets and Related Estimated Useful Lives (Details) - USD ($) $ in Thousands					12 Months Ended
	Oct. 22, 2018	Sep. 20, 2018	Nov. 10, 2016	Mar. 18, 2016	Dec. 31, 2018
Allocated fair value			$ 4,544
Weighted average useful life (Year)					9 years 182 days
Cardial [Member]
Allocated fair value	$ 623
Weighted average useful life (Year)	9 years 146 days
Applied Medical [Member]
Allocated fair value		$ 6,527
Weighted average useful life (Year)		13 years
ProCol Biologic Graft [Member]
Allocated fair value				$ 620
Weighted average useful life (Year)				8 years 219 days
Noncompete Agreements [Member]
Allocated fair value			$ 180
Weighted average useful life (Year)			5 years
Noncompete Agreements [Member] | Cardial [Member]
Allocated fair value	$ 46
Weighted average useful life (Year)	5 years
Noncompete Agreements [Member] | Applied Medical [Member]
Allocated fair value		$ 530
Weighted average useful life (Year)		5 years
Noncompete Agreements [Member] | ProCol Biologic Graft [Member]
Allocated fair value				$ 84
Weighted average useful life (Year)				109 years
Trade Names [Member]
Allocated fair value			$ 271
Weighted average useful life (Year)			9 years
Trade Names [Member] | Cardial [Member]
Allocated fair value	$ 90
Weighted average useful life (Year)	5 years
Trade Names [Member] | Applied Medical [Member]
Allocated fair value		$ 206
Weighted average useful life (Year)		7 years
Customer Relationships [Member]
Allocated fair value			$ 683
Weighted average useful life (Year)			12 years 182 days
Customer Relationships [Member] | Cardial [Member]
Allocated fair value	$ 250
Weighted average useful life (Year)	16 years
Customer Relationships [Member] | Applied Medical [Member]
Allocated fair value		$ 4,475
Weighted average useful life (Year)		1316 years
Customer Relationships [Member] | ProCol Biologic Graft [Member]
Allocated fair value				$ 150
Weighted average useful life (Year)				9 years
Procurement Contracts [Member]
Allocated fair value			$ 617
Weighted average useful life (Year)			9 years
Technology [Member]
Allocated fair value			$ 2,793
Weighted average useful life (Year)			10 years 182 days
Technology [Member] | ProCol Biologic Graft [Member]
Allocated fair value				$ 277
Weighted average useful life (Year)				9 years
Intellectual Property [Member] | Cardial [Member]
Allocated fair value	$ 237
Weighted average useful life (Year)	5 years