OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2017

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,
	2017			2016			2015
Balances at beginning of period	$	237		$	189		$	216
Additions - charged to expense	168			163			83
Deductions - write offs, net of recoveries	(190		)	(115		)	(110		)
Balances at end of period	$	215		$	237		$	189

Schedule of inventory

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

	December 31,
	2017			2016
Raw materials	$	18,465		$	10,807
Work in process	4,296			3,820
Finished goods	11,465			7,087
Allowance for excess or obsolete inventory	(1,630		)	(1,319		)
	$	32,596		$	20,395

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,
	2017			2016
Land	$	377		$	377
Building	2,868			2,868
Machinery and equipment	38,432			36,588
Leasehold and building improvements	8,156			7,662
Construction in progress	3,531			1,655
	53,364			49,150
Less accumulated depreciation	(36,033		)	(32,569		)
Total property and equipment, net	$	17,331		$	16,581