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Organization and Significant Accounting Policies - Concentration of Credit Risk (Details) - Customer concentration	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Sales Revenue | US Government Agencies
Concentration of Credit Risk
Concentration Risk, Percentage	75.00%	76.00%	68.00%
Sales Revenue | US Army
Concentration of Credit Risk
Concentration Risk, Percentage	20.00%	11.00%	6.00%
Accounts receivable balances | US Government Agencies
Concentration of Credit Risk
Concentration Risk, Percentage	75.00%	41.00%

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