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Statements of Common Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2019 $ 83,976 $ 50,209 $ 134,185
Balance (in shares) at Dec. 31, 2019 13,014,898    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 12,888 12,888
Cash dividends declared 0 (7,044) (7,044)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,273 0 1,273
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 29,427    
Stock-based compensation $ 126 0 126
Stock-based compensation (in shares) 4,912    
Balance at Sep. 30, 2020 $ 85,375 56,053 141,428
Balance (in shares) at Sep. 30, 2020 13,049,237    
Balance at Jun. 30, 2020 $ 84,872 53,700 138,572
Balance (in shares) at Jun. 30, 2020 13,033,999    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 4,704 4,704
Cash dividends declared 0 (2,351) (2,351)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 429 0 429
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 10,326    
Stock-based compensation $ 74 0 74
Stock-based compensation (in shares) 4,912    
Balance at Sep. 30, 2020 $ 85,375 56,053 141,428
Balance (in shares) at Sep. 30, 2020 13,049,237    
Balance at Dec. 31, 2020 $ 85,935 57,317 $ 143,252
Balance (in shares) at Dec. 31, 2020 13,060,817   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   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   13,102,924