Condensed Consolidated Statements Of Income - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Condensed Consolidated Statements Of Income [Abstract]
Net sales	$ 72,959,074	$ 66,159,586	$ 144,183,367	$ 125,344,917
Cost of products sold	65,855,506	60,340,917	130,322,745	113,755,658
Gross profit	7,103,568	5,818,669	13,860,622	11,589,259
Selling and administrative expenses	5,642,273	5,555,385	11,554,419	10,915,276
Operating income	1,461,295	263,284	2,306,203	673,983
Other income	(35,815)	(39,870)	(80,166)	(99,272)
Interest expense	345,656	276,538	654,070	519,781
Income from operations before income tax expense	1,151,454	26,616	1,732,299	253,474
Income tax expense (benefit)	415,339	(6,679)	613,302	73,582
Net income	$ 736,115	$ 33,295	$ 1,118,997	$ 179,892
Earnings per share - basic	$ 0.18	$ 0.01	$ 0.27	$ 0.04
Earnings per share - diluted	$ 0.17	$ 0.01	$ 0.26	$ 0.04
Weighted average shares of common stock outstanding Basic	4,201,442	4,185,752	4,198,714	4,184,854
Weighted average shares of common stock outstanding Diluted	4,326,854	4,225,874	4,302,977	4,225,844