Note 5 - Equipment - Schedule of equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Line Items]
Cost	$ 722	$ 713
Accumulated depreciation	(608)	(570)
Write off	(90)	(39)
Net book value	24	104
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Cost	18	19
Accumulated depreciation	(13)	(11)
Write off	(4)	(1)
Net book value	1	7
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	114	108
Accumulated depreciation	(76)	(47)
Write off	(34)	(22)
Net book value	4	39
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	571	586
Accumulated depreciation	(519)	(512)
Write off	(52)	(16)
Net book value	0	$ 58
Software [Member]
Property, Plant and Equipment [Line Items]
Cost	19
Accumulated depreciation	0
Write off	0
Net book value	$ 19