Inventories (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Inventories [Abstract]
Raw materials	$ 5,210,000	$ 5,130,000
Work in process	2,635,000	4,360,000
Finished goods	5,125,000	5,779,000
Provision for excess and obsolete inventory	(327,000)	(357,000)
Total inventories	12,643,000	14,912,000
Goods in transit	$ 100,000	$ 300,000