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Statements of Common Stockholders' Equity (Unaudited) - 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 4,327 4,327
Cash dividends declared 0 (3,022) (3,022)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 405 0 405
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 11,768    
Stock-based compensation $ 43 0 43
Stock-based compensation (in shares) (513)    
Balance at Mar. 31, 2024 $ 136,622 86,309 222,931
Balance (in shares) at Mar. 31, 2024 14,343,500    
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 3,638 $ 3,638
Cash dividends declared 0 (3,154) (3,154)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 395 0 395
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 12,385    
Stock-based compensation $ 72 0 72
Stock-based compensation (in shares) 983    
Balance at Mar. 31, 2025 $ 138,556 $ 93,587 $ 232,143
Balance (in shares) at Mar. 31, 2025 14,399,650   14,399,650