OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Changes in allowance for doubtful accounts

Changes in allowance for doubtful accounts are summarized as follows (in thousands):

	Years Ended December 31,
	2013		2014		2015
Balances at beginning of period	$	155	$	209	$	216
Additions - charged to expense	98		143		83
Deductions - write offs, net of recoveries	(44)		(136)		(110)
Balances at end of period	$	209	$	216	$	189

Schedule of inventory

Inventories, net consist of the following (in thousands):

	December 31,
	2014			2015
Raw materials	$	6,298		$	8,531
Work in process	2,966			2,839
Finished goods	4,949			6,122
Allowance for excess or obsolete inventory	(1,555		)	(1,391		)
	$	12,658		$	16,101

Schedule of property and equipment

We provide for depreciation primarily using the straight-line method by charges to income in amounts that allocate the cost of property and equipment over their estimated useful lives as follows:

Asset Classification	Estimated Useful Life
Building	10 to 20 years
Machinery and equipment	3 to 15 years
Leasehold and building improvements	7 to 15 years

Detail of property and equipment is as follows (in thousands):

	December 31,
	2014			2015
Land	$	377		$	377
Building	2,868			2,868
Machinery and equipment	30,655			35,284
Leasehold and building improvements	5,871			6,673
Construction in progress	185			1,496
	39,956			46,698
Less accumulated depreciation and amortization	(26,546		)	(29,678		)
Total property and equipment, net	$	13,410		$	17,020