Statements of Common Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2023	$ 136,174	$ 85,004	$ 221,178
Balance (in shares) at Dec. 31, 2023	14,332,245
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	20,325	20,325
Cash dividends declared	0	(12,226)	(12,226)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans	$ 1,669	0	1,669
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares)	48,163
Stock-based compensation	$ 246	0	246
Stock-based compensation (in shares)	5,874
Balance at Dec. 31, 2024	$ 138,089	93,103	$ 231,192
Balance (in shares) at Dec. 31, 2024	14,386,282		14,386,282
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	20,058	$ 20,058
Cash dividends declared	0	(12,766)	(12,766)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans	$ 1,601	0	1,601
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares)	51,774
Stock-based compensation	$ 262	0	262
Stock-based compensation (in shares)	8,525
Balance at Dec. 31, 2025	$ 139,952	$ 100,395	$ 240,347
Balance (in shares) at Dec. 31, 2025	14,446,581		14,446,581