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Note 5 - Goodwill and Other Intangibles (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Goodwill, Purchase Accounting Adjustments		$ (1,345)	$ 0
Impairment of Intangible Assets, Finite-lived			$ 4,500
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		2 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		16 years
Weighted Average [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		11 years 8 months 12 days
CardioCel and VascuCel Biologic Patches [Member]
Goodwill, Purchase Accounting Adjustments	$ (1,300)
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	$ 1,300