Note 13 - Subsequent Events (Details Textual) - Changzhou Eminence Biotechnology [Member] - Subsequent Event [Member] $ in Millions	Oct. 20, 2020 USD ($)
Business Acquisition, Percentage of Voting Interests Acquired	47.60%
Business Combination, Consideration Transferred, Total	$ 10

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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