Condensed Consolidated Statements Of Operations - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Condensed Consolidated Statements Of Operations [Abstract]
Net sales	$ 69,723,493	$ 61,533,519	$ 133,944,439	$ 116,480,996
Cost of products sold	62,126,480	55,719,766	120,117,152	105,920,795
Gross profit	7,597,013	5,813,753	13,827,287	10,560,201
Selling and administrative expenses	5,534,075	4,847,801	10,579,428	9,362,012
Operating income	2,062,938	965,952	3,247,859	1,198,189
Other income	(45,206)	(35,818)	(85,787)	(75,694)
Interest expense	251,108	278,516	514,287	535,063
Income from operations before income tax expense	1,857,036	723,254	2,819,359	738,820
Income tax expense	700,738	576,825	1,004,255	575,581
Net income	$ 1,156,298	$ 146,429	$ 1,815,104	$ 163,239
Earnings per share - basic	$ 0.28	$ 0.04	$ 0.44	$ 0.04
Earnings per share - diluted	$ 0.27	$ 0.04	$ 0.43	$ 0.04
Weighted average shares of common stock outstanding Basic	4,166,758	4,044,240	4,157,516	4,036,387
Weighted average shares of common stock outstanding Diluted	4,214,317	4,120,178	4,241,000	4,118,711