Fair Value Measurements (Details) - Recurring basis - USD ($) $ in Thousands	Jan. 31, 2026	Apr. 30, 2025
Fair Value Measurements
Equity securities	$ 6,220	$ 1,080
Warrants	2,430	124
Total	8,650	1,204
Financial liabilities measured at fair value	0	0
Quoted prices in active market for identical assets (Level 1)
Fair Value Measurements
Equity securities	6,220	1,080
Total	6,220	1,080
Significant other observable inputs (Level 2)
Fair Value Measurements
Warrants	2,430	124
Total	$ 2,430	$ 124