Other Accrued Liabilities (Details 1) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accrued warranty
Balance at beginning of period	$ 74,000	$ 93,000	$ 74,000	$ 117,000
Accruals for warranties issued during the period		46,000		57,000
Warranty claims		(28,000)		(463,000)
Balance at end of period	$ 74,000	$ 111,000	$ 74,000	$ 111,000