Income Tax (Narrative) (Details) - USD ($)	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Apr. 30, 2022	Apr. 23, 2020
Income Tax [Line Items]
Effective tax rate	27.77%	7.92%
Operating loss carryforwards, valuation allowance	$ 4,463,515		$ 4,543,819
Cumulative earnings	11,038,000
Income Tax Expense Benefit	529,400	$ 756,945
Paycheck Protection Program [Member] | U.S. Bank [Member]
Income Tax [Line Items]
Loan				$ 6,282,973
SigmaTron and Wagz [Member] | Federal And State [Member]
Income Tax [Line Items]
Operating loss carryforwards, valuation allowance	4,129,312
Vietnam [Member]
Income Tax [Line Items]
Operating loss carryforwards, valuation allowance	$ 334,203