Inventories (Details) (USD $)	Jul. 31, 2013	Apr. 30, 2013
Notes to Financial Statements
Raw materials	$ 1,573,732	$ 1,425,386
Work in process	63,475	88,603
Finished goods	1,084,956	1,389,065
Inventories	$ 2,722,163	$ 2,903,054

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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