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Statements of Common Stockholders' Equity (Unaudited) - 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 3,705 3,705
Cash dividends declared 0 (2,448) (2,448)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 473 0 473
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 10,916    
Stock-based compensation $ 28 0 28
Stock-based compensation (in shares) 0    
Balance at Mar. 31, 2021 $ 86,436 58,574 145,010
Balance (in shares) at Mar. 31, 2021 13,071,733    
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 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   13,123,619