Consolidated Statements Of Operations - USD ($)	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Consolidated Statements Of Operations [Abstract]
Net sales	$ 281,042,482	$ 290,553,951
Cost of products sold	255,937,592	264,212,182
Gross profit	25,104,890	26,341,769
Selling and administrative expenses	22,292,309	23,263,117
Operating income	2,812,581	3,078,652
Other income	(119,613)	(200,946)
Interest expense	1,839,060	2,413,297
Income before income taxes	1,093,134	866,301
Income tax expense	650,032	1,731,415
NET INCOME (LOSS)	$ 443,102	$ (865,114)
Earnings (loss) per common share - Basic	$ 0.10	$ (0.20)
Earnings (loss) per common share - Diluted	$ 0.10	$ (0.20)
Weighted-average shares of common stock outstanding - Basic	4,242,351	4,228,592
Weighted-average shares of common stock outstanding - Diluted	4,270,050	4,228,592