Note 9 - Discontinued Operations (Details Textual) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
May 01, 2021	May 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Proceeds from Sale of Productive Assets, Total			$ 4,203	$ 0
PUC-regulated Assets of Kapalua Water Company, Ltd and Kapalua Waste Treatment Company, Ltd [Member]
Proceeds from Sale of Productive Assets, Total	$ 4,200	$ 4,200

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

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