Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 79	$ 22
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares issued (in shares)	12,221,484	12,221,484
Common stock, shares outstanding (in shares)	7,419,470	7,414,794
Treasury store shares at cost (in shares)	4,802,014	4,806,690