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Statements of Common Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2021 $ 88,230 $ 64,392 $ 152,622
Balance (in shares) at Dec. 31, 2021 13,112,948    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 3,859 3,859
Cash dividends declared 0 (2,556) (2,556)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 450 0 450
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 10,671    
Stock-based compensation $ 45 0 45
Stock-based compensation (in shares) 0    
Balance at Mar. 31, 2022 $ 88,725 65,695 154,420
Balance (in shares) at Mar. 31, 2022 13,123,619    
Balance at Dec. 31, 2022 $ 134,220 72,963 $ 207,183
Balance (in shares) at Dec. 31, 2022 14,285,584   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   14,294,898