CONSOLIDATED BALANCE SHEETS) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Trade accounts receivable, net of allowance	$ 83	$ 66
STOCKHOLDERS' EQUITY
Preferred stock, authorized shares	5,000,000	5,000,000
Common stock, authorized shares	30,000,000	30,000,000
Common stock, issued shares	8,619,522	8,416,335
Common stock, outstanding shares	8,619,522	8,416,335
Series A Junior Participating
STOCKHOLDERS' EQUITY
Preferred stock, authorized shares	200,000	200,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0