Other Accrued Liabilities (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accrued warranty
Balance at beginning of period	$ 111,000	$ 140,000	$ 117,000	$ 227,000
Accruals for warranties issued during the period	39,000	14,000	96,000	94,000
Warranty claims	(54,000)	(49,000)	(117,000)	(216,000)
Balance at end of period	$ 96,000	$ 105,000	$ 96,000	$ 105,000