Income Taxes (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Liability for uncertain tax positions
Balance at the beginning of the period	$ 458,000	$ 430,000
Resolution of prior year items		(3,000)
Increases due to current year positions	5,000	10,000
Increases due to interest	23,000	21,000
Balance at the end of the period	$ 486,000	$ 458,000