Note 10 - Governmental Assistance Programs (Details Textual) - USD ($)	3 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Government Assistance, Amount	$ 0	$ 22,000
Employment Support Scheme [Member]
Government Assistance, Amount	$ 0	$ 22,000

Amount of government assistance recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483507/832-10-50-3

Name:	us-gaap_GovernmentAssistanceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration