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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 8,184 8,184
Cash dividends declared 0 (4,693) (4,693)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 844 0 844
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 19,101    
Stock-based compensation $ 52 0 52
Stock-based compensation (in shares) 0    
Balance at Jun. 30, 2020 $ 84,872 53,700 138,572
Balance (in shares) at Jun. 30, 2020 13,033,999    
Balance at Mar. 31, 2020 $ 84,424 51,865 136,289
Balance (in shares) at Mar. 31, 2020 13,024,187    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 4,182 4,182
Cash dividends declared 0 (2,347) (2,347)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 433 0 433
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 9,812    
Stock-based compensation $ 15 0 15
Stock-based compensation (in shares) 0    
Balance at Jun. 30, 2020 $ 84,872 53,700 138,572
Balance (in shares) at Jun. 30, 2020 13,033,999    
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 8,189 $ 8,189
Cash dividends declared 0 (4,900) (4,900)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,044 0 1,044
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 23,068    
Stock-based compensation $ 121 0 121
Stock-based compensation (in shares) 6,170    
Balance at Jun. 30, 2021 $ 87,100 60,606 $ 147,706
Balance (in shares) at Jun. 30, 2021 13,090,055   13,090,055
Balance at Mar. 31, 2021 $ 86,436 58,574 $ 145,010
Balance (in shares) at Mar. 31, 2021 13,071,733    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 4,484 4,484
Cash dividends declared 0 (2,452) (2,452)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 571 0 571
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 12,152    
Stock-based compensation $ 93 0 93
Stock-based compensation (in shares) 6,170    
Balance at Jun. 30, 2021 $ 87,100 $ 60,606 $ 147,706
Balance (in shares) at Jun. 30, 2021 13,090,055   13,090,055