CONSOLIDATED BALANCE SHEETS (in thousands, except share data) (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Trade accounts receivable, net of allowance	$ 66	$ 80
STOCKHOLDERS' EQUITY
Preferred stock, authorized shares (including Series A)	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	8,416,335	8,212,748
Common stock, outstanding shares	8,416,335	8,212,748