Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
CURRENT ASSETS:
Allowance for doubtful accounts	$ 34	$ 56
Accumulated amortization	$ 549	$ 549
STOCKHOLDERS' EQUITY:
Common stock, par value (in dollars per share)	$ 0.0024	$ 0.0024
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares issued (in shares)	9,756,724	9,717,525
Common stock, shares outstanding (in shares)	8,332,348	8,293,149
Treasury stock, shares (in shares)	1,424,376	1,424,376