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Inventory (Details) - USD ($)	Nov. 30, 2018	May 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 709,862	$ 726,852
Work-in-process	10,806,618	9,990,225
Finished goods	665,245	700,698
Gross inventory	12,181,725	11,417,775
Less allowance for obsolescence	100,000	100,000
Net Inventory	$ 12,081,725	$ 11,317,775

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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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