Consolidated Statements of Income (USD $)	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Consolidated Statements of Income [Abstract]
Net sales	$ 156,635,984	$ 151,728,084
Cost of products sold	141,381,443	135,940,878
Gross profit	15,254,541	15,787,206
Selling and administrative expenses	12,611,673	11,460,908
Operating income	2,642,868	4,326,298
Other income	(38,952)	(9,602)
Interest expense	1,025,325	1,154,352
Income before income tax expense	1,656,495	3,181,548
Income tax expense	522,171	1,203,514
NET INCOME	$ 1,134,324	$ 1,978,034
Earnings per common share
Basic	$ 0.29	$ 0.52
Diluted	$ 0.29	$ 0.51
Weighted-average shares of common stock outstanding
Basic	3,878,207	3,828,638
Diluted	3,906,279	3,890,949