CONSOLIDATED BALANCE SHEETS (in thousands, except share data) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Trade accounts receivable, net of allowance	$ 72	$ 75
STOCKHOLDERS' EQUITY
Preferred stock, authorized shares	5,000,000	5,000,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, authorized shares	30,000,000	30,000,000
Common stock, issued shares	8,261,702	8,338,628
Common stock, outstanding shares	8,261,702	8,338,628
Series A Junior Participating
STOCKHOLDERS' EQUITY
Preferred stock, authorized shares	200,000	200,000