CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Preferred stock, no par value
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, no par value
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	15,622,000	15,359,000
Common stock, shares outstanding (in shares)	15,622,000	15,359,000