CONSOLIDATED BALANCE SHEETS (in thousands, except share data) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Trade accounts receivable, net of allowance	$ 87	$ 75
STOCKHOLDERS' EQUITY
Preferred stock, authorized shares (including Series A)	5,000,000	5,000,000
Preferred stock, issued shares	200,000	200,000
Preferred stock, outstanding shares	200,000	200,000
Common stock, authorized shares	30,000,000	30,000,000
Common stock, issued shares	8,287,825	8,338,628
Common stock, outstanding shares	8,287,825	8,338,628