Note 13 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 11, 2019
CardioCel and VascuCel Biologic Patches [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 7,800
CardioCel and VascuCel Biologic Patches [Member] \| Audited Carve-Out Financial Statements of the Acquired Business [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	300
CardioCel and VascuCel Biologic Patches [Member] \| Third Holdback [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	2,000
Business Combination, Contingent Consideration, Liability, Total		$ 2,000
CardioCel and VascuCel Biologic Patches [Member] \| Extension of Product Shelf Life from 36 Months to 60 Months in the First Anniversary of Closing Date [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	500
Business Combination, Contingent Consideration, Liability, Total		500
CardioCel and VascuCel Biologic Patches [Member] \| Achievement of Specified Levels of Revenues [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	5,000
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure	$ 0
Fair Value, Inputs, Level 3 [Member] \| CardioCel and VascuCel Biologic Patches [Member]
Business Combination, Contingent Consideration, Liability, Total		$ 2,000

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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