Note 17 - Subsequent Events (Details Textual) - Sexton Biotechnologies, Inc. [Member] - Subsequent Event [Member] $ in Millions	Aug. 09, 2021 USD ($)
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 30
Business Acquisition, Percentage of Equity Issuable Shares Held in Escrow Accounts for Post Closing Claims	10.00%

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477

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