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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 12,983 12,983
Cash dividends declared 0 (7,354) (7,354)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,612 0 1,612
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 35,937    
Stock-based compensation $ 167 0 167
Stock-based compensation (in shares) 6,170    
Balance at Sep. 30, 2021 $ 87,714 62,946 150,660
Balance (in shares) at Sep. 30, 2021 13,102,924    
Balance at Jun. 30, 2021 $ 87,100 60,606 147,706
Balance (in shares) at Jun. 30, 2021 13,090,055    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 4,794 4,794
Cash dividends declared 0 (2,454) (2,454)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 568 0 568
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 12,869    
Stock-based compensation $ 46 0 46
Stock-based compensation (in shares) 0    
Balance at Sep. 30, 2021 $ 87,714 62,946 150,660
Balance (in shares) at Sep. 30, 2021 13,102,924    
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 14,569 $ 14,569
Cash dividends declared 0 (8,115) (8,115)
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 $ 1,322 0 1,322
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 33,016    
Stock-based compensation $ 208 0 208
Stock-based compensation (in shares) 7,552    
Balance at Sep. 30, 2022 $ 133,730 70,846 $ 204,576
Balance (in shares) at Sep. 30, 2022 14,275,456   14,275,456
Balance at Jun. 30, 2022 $ 133,239 67,945 $ 201,184
Balance (in shares) at Jun. 30, 2022 14,264,763    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 5,681 5,681
Cash dividends declared 0 (2,780) (2,780)
Issuance of common stock $ 0 0 0
Issuance of common stock (in shares) 0    
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 441 0 441
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 11,160    
Stock-based compensation $ 50 0 50
Stock-based compensation (in shares) (467)    
Balance at Sep. 30, 2022 $ 133,730 $ 70,846 $ 204,576
Balance (in shares) at Sep. 30, 2022 14,275,456   14,275,456