Other Accrued Liabilities (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accrued warranty
Balance at beginning of period	$ 74,000	$ 111,000	$ 74,000	$ 117,000
Accruals for warranties issued during the period		39,000		96,000
Warranty claims		(54,000)		(117,000)
Balance at end of period	$ 74,000	$ 96,000	$ 74,000	$ 96,000