Selling, General And Administrative - Summary of Selling, General and Administrative Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2024
Selling, General and Administrative Expense [Abstract]
Salaries and directors' fees	$ 919	$ 819	$ 789
Office and administrative	2,204	2,172	2,122
Professional fees and insurance	1,003	888	952
Transfer agent and regulatory fees	417	360	561
Stock-based compensation	746	561	547
Selling, general and administration expense	$ 5,289	$ 4,800	$ 4,971

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.