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Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Apr. 30, 2022
Payables and Accruals [Abstract]
Project costs	$ 100	$ 59
Contract loss reserve	435	328
Employee incentive payments	355	266
Accrued salary and benefits	31	60
Legal and accounting fees	24	30
Other	145	134
Accrued expenses total	$ 1,090	$ 877

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for the acquisition of merchandise, materials, supplies and services pertaining to construction projects such as a housing development or factory expansion not classified as trade payables. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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