Notes to Condensed Consolidated Financial Statements (Tables)

6 Months Ended

Nov. 30, 2017

Inventory Disclosure [Abstract]

Inventory

	November 30, 2017		May 31, 2017
Raw materials	$	890,587	$	709,174
Work-in-process		10,681,902		10,071,179
Finished goods		317,939		808,257
		11,890,428		11,588,610
Less allowance for obsolescence		100,000		100,000
	$	11,790,428	$	11,488,610