4. Inventories

9 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories are valued at the lower of cost (determined on a first-in, first-out basis) or net realizable value, and have been reduced by an allowance for excess and obsolete inventories. The estimate is based on managements review of inventories on hand compared to estimated future usage and sales. Cost of work-in-process and finished goods inventories include material, labor, and manufacturing overhead.

	March 31, 2018	June 30, 2017
Raw materials	$1,525,400	$1,373,800
Work-in-process	831,000	166,500
Finished goods	345,200	420,900
	$2,701,600	$1,961,200