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CONSOLIDATED BALANCE SHEETS (in thousands, except share data) (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Trade accounts receivable, net of allowance	$ 69	$ 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	8,421,599	8,416,335
Common stock, outstanding shares	8,421,599	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

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Amount of allowance for credit loss on accounts receivable, classified as current.

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