Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 22	$ 50
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)	7,414,794	7,357,450
Treasure stock shares at cost (in shares)	4,806,690	4,864,034