Inventories, Net (Components Of Inventory) (Details) - USD ($)	Oct. 31, 2017	Apr. 30, 2017
Inventories, Net [Abstract]
Finished products	$ 21,213,051	$ 20,291,768
Work-in-process	1,642,188	1,795,852
Raw materials	59,342,433	52,748,542
Total inventory, gross	82,197,672	74,836,162
Less excess and obsolescence reserve	(1,242,041)	(1,264,924)
Total inventory, net	$ 80,955,631	$ 73,571,238