Note 13 - Segment Information - Long-lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Total long-lived assets	$ 394	$ 463
UNITED STATES
Total long-lived assets	186	221
UNITED KINGDOM
Total long-lived assets	111	105
CHINA
Total long-lived assets	78	90
Other Foreign Countries [Member]
Total long-lived assets	$ 19	$ 47

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599

Name:	us-gaap_NoncurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant