SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ALLOWANCE FOR DOUBTFUL ACCOUNTS
VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
Balance at beginning of period	$ 424	$ 378	$ 390
Additions charged to income	63	267
Deductions	(10)	(149)
Other Adjustments	(71)	(72)	(12)
Balance at end of period	406	424	378
WARRANTY RESERVE
VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
Balance at beginning of period	592	597	298
Additions charged to income	175	756	463
Deductions	(134)	(761)	(164)
Other Adjustments	(190)
Balance at end of period	443	592	597
INVENTORY RESERVE
VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
Balance at beginning of period	157	225	256
Additions charged to income	310	77	210
Deductions	(130)	(145)	(241)
Balance at end of period	$ 337	$ 157	$ 225