Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
STOCKHOLDERS' EQUITY
Accounts receivable, allowance	$ 1,013	$ 1,007
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	8,000,000	8,000,000
Common stock, shares issued	5,065,518	5,065,518
Common stock, shares outstanding	3,520,646	3,520,646
Treasury stock, shares	1,544,872	1,544,872