Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Common stock, shares par value	$ 0.06	$ 0.06
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	13,628,000	13,530,000
Common stock, shares outstanding	13,628,000	13,530,000
Treasury stock, shares	416,000	447,000