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Statements of Common Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2022 $ 134,220 $ 72,963 $ 207,183
Balance (in shares) at Dec. 31, 2022 14,285,584    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 3,653 3,653
Cash dividends declared 0 (2,897) (2,897)
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) 9,314    
Stock-based compensation $ 54 0 54
Stock-based compensation (in shares) 0    
Balance at Mar. 31, 2023 $ 134,679 73,719 208,398
Balance (in shares) at Mar. 31, 2023 14,294,898    
Balance at Dec. 31, 2023 $ 136,174 85,004 $ 221,178
Balance (in shares) at Dec. 31, 2023 14,332,245   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   14,343,500