Note 17 - Subsequent Event (Details Textual) $ in Millions	Jan. 15, 2021 USD ($)
Subsequent Event [Member] \| STR Holdings, Inc. [Member]
Business Combination, Consideration Transferred, Total	$ 6.3

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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