Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
CURRENT ASSETS:
Allowance for doubtful accounts	$ 56	$ 24
Accumulated amortization	$ 549	$ 548
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)	9,717,525	9,971,711
Common stock, shares outstanding (in shares)	8,293,149	8,547,335
Treasury stock, shares (in shares)	1,424,376	1,424,376