Other Accrued Liabilities (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Accrued warranty
Balance at beginning of period	$ 117,000	$ 227,000
Accruals for warranties issued during the period	96,000	141,000
Warranty claims	(139,000)	(251,000)
Balance at end of period	$ 74,000	$ 117,000