Inventories (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Inventories [Abstract]
Raw materials	$ 5,175,000	$ 5,077,000
Work-in-process	64,000	379,000
Finished goods	4,975,000	3,699,000
Total inventory	10,214,000	9,155,000
Shipping goods to customers, cost	$ 1,500,000