CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Allowance for doubtful accounts	$ 62	$ 50
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 10,961	$ 8,900
Preferred stock, par value (in dollars per share)	$ 0.005	$ 0.005
Preferred stock, shares authorized	873	873
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	6,160	6,128
Treasury stock, shares	668	668