BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Activity in the allowance for doubtful accounts
Beginning balance	$ 284	$ 226
Additional reserves	(25)	74
Write-offs	(82)	(16)
Ending balance	177	284
Inventories
Parts and raw materials	13,174	11,268
Work-in-process	1,504	2,017
Finished goods	2,096	3,090
Inventory, gross	16,774	16,375
Less reserves	(2,073)	(1,946)
Inventories, net	14,701	14,429
Provision for excess and obsolete inventory	$ 265	$ 77