CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Accounts receivable allowance	$ 10	$ 10
Stockholders' equity:
Preferred stock par value	$ .001	$ 0.001
Preferred stock shares authorized	10,000,000	10,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Common stock par value	$ 0.001	$ 0.001
Common stock shares authorized	24,500,000	24,500,000
Common stock issued	15,438,660	15,408,660
Treasury stock, shares	4,184,755	587,847