CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Details
Sales	$ 30,508	$ 32,944
Cost of sales	(19,557)	(20,871)
Gross profit	10,951	12,073
Operating expenses:
Selling, general and administrative	(6,045)	(7,115)
Research and development	(2,908)	(2,344)
Pension	(231)	(262)
Total operating expenses	(9,184)	(9,721)
Operating income	1,767	2,352
Interest expense	(473)	(510)
Other income (expense), net	76	(6)
Income before income tax benefit (provision)	1,370	1,836
Income tax benefit (provision)	111	(93)
Net income	$ 1,481	$ 1,743
Net income per common share - basic	$ 0.13	$ 0.16
Net income per common share - diluted	$ 0.12	$ 0.15
Weighted average common shares outstanding - basic	11,353	11,214
Weighted average common shares outstanding - diluted	12,014	11,836
Comprehensive income, net of tax:
Net income	$ 1,481	$ 1,743
Decrease (increase) in minimum pension liability	(30)	258
Total comprehensive income	$ 1,451	$ 2,001