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Statements of Common Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2020 $ 85,935 $ 57,317 $ 143,252
Balance (in shares) at Dec. 31, 2020 13,060,817    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 16,984 16,984
Cash dividends declared 0 (9,909) (9,909)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 2,082 0 2,082
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 45,961    
Stock-based compensation $ 213 0 213
Stock-based compensation (in shares) 6,170    
Balance at Dec. 31, 2021 $ 88,230 64,392 $ 152,622
Balance (in shares) at Dec. 31, 2021 13,112,948   13,112,948
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 19,580 $ 19,580
Cash dividends declared 0 (11,009) (11,009)
Issuance of common stock $ 43,970 0 43,970
Issuance of common stock (in shares) 1,121,940    
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,741 0 1,741
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 42,739    
Stock-based compensation $ 279 0 279
Stock-based compensation (in shares) 7,957    
Balance at Dec. 31, 2022 $ 134,220 $ 72,963 $ 207,183
Balance (in shares) at Dec. 31, 2022 14,285,584   14,285,584