Note 3 - Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024
Assets, Fair Value Disclosure [Abstract]
Treasury bills and term deposits	$ 16,353
Guaranteed investment certificates and term deposits classified as cash equivalents		$ 19,725
Guaranteed investment certificates and term deposits classified as short-term investments	15
Total assets	16,368	19,725
Financial Liabilities Fair Value Disclosure [Abstract]
Derivative warrant liabilities	2,964	4,359
Total liabilities	2,964	4,359
Quoted prices in active markets (Level 1)
Assets, Fair Value Disclosure [Abstract]
Treasury bills and term deposits	16,353
Guaranteed investment certificates and term deposits classified as cash equivalents		19,725
Guaranteed investment certificates and term deposits classified as short-term investments	15
Total assets	16,368	19,725
Financial Liabilities Fair Value Disclosure [Abstract]
Derivative warrant liabilities	0	0
Total liabilities	0	0
Significant other observable inputs (Level 2)
Assets, Fair Value Disclosure [Abstract]
Treasury bills and term deposits	0
Guaranteed investment certificates and term deposits classified as cash equivalents		0
Guaranteed investment certificates and term deposits classified as short-term investments	0
Total assets	0	0
Financial Liabilities Fair Value Disclosure [Abstract]
Derivative warrant liabilities	0	0
Total liabilities	0	0
Significant unobservable inputs (Level 3)
Assets, Fair Value Disclosure [Abstract]
Treasury bills and term deposits	0
Guaranteed investment certificates and term deposits classified as cash equivalents		0
Guaranteed investment certificates and term deposits classified as short-term investments	0
Total assets	0	0
Financial Liabilities Fair Value Disclosure [Abstract]
Derivative warrant liabilities	2,964	4,359
Total liabilities	$ 2,964	$ 4,359