CONDENSED CONSOLDIATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 332	$ 302
Preferred stock, par value
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	7,299,376	7,294,617
Common stock, shares outstanding	7,299,376	7,294,617