Condensed Consolidated Statements Of Operations - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Condensed Consolidated Statements Of Operations [Abstract]
Net sales	$ 69,618,424	$ 74,855,312	$ 130,143,380	$ 148,865,293
Cost of products sold	62,858,882	67,725,826	119,111,647	134,775,475
Gross profit	6,759,542	7,129,486	11,031,733	14,089,818
Selling and administrative expenses	5,421,739	5,700,288	10,481,264	11,527,614
Operating income	1,337,803	1,429,198	550,469	2,562,204
Other income	(40,611)	(10,863)	(44,709)	(77,225)
Interest expense	308,613	462,772	646,877	1,054,000
Income (loss) before income tax expense	1,069,801	977,289	(51,699)	1,585,429
Income tax expense	442,943	316,106	222,109	563,221
Net income (loss)	$ 626,858	$ 661,183	$ (273,808)	$ 1,022,208
Earnings (loss) per common share - basic	$ 0.15	$ 0.16	$ (0.06)	$ 0.24
Earnings (loss) per common share - diluted	$ 0.15	$ 0.15	$ (0.06)	$ 0.24
Weighted average shares of common stock outstanding - Basic	4,257,508	4,242,508	4,254,247	4,242,196
Weighted average shares of common stock outstanding - Diluted	4,257,508	4,278,901	4,254,247	4,251,590