Inventories (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Classification of inventories [Abstract]
Raw materials	$ 1,408,000	$ 1,418,000
Work in process	1,306,000	1,325,000
Finished goods	924,000	803,000
Total Inventories, net	3,638,000	3,546,000
Inventory reserve for obsolescence	$ 2,773,000	$ 3,016,000