Note 12 - Subsequent Events (Details Textual) - At-the-market Offering Program [Member] - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Apr. 30, 2021
Proceeds from Issuance of Common Stock	$ 0
Subsequent Event [Member]
Equity Offering, Maximum Offering Amount		$ 25,000

The cash inflow from the additional capital contribution to the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration