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Statements of Common Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2018 $ 81,305 $ 44,890 $ 126,195
Balance (in shares) at Dec. 31, 2018 12,943,536    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 11,013 11,013
Cash dividends declared 0 (6,739) (6,739)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,220 0 1,220
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 34,327    
Stock-based compensation $ 119 0 119
Stock-based compensation (in shares) 6,963    
Balance at Sep. 30, 2019 $ 82,644 49,164 131,808
Balance (in shares) at Sep. 30, 2019 12,984,826    
Balance at Jun. 30, 2019 $ 82,183 46,931 129,114
Balance (in shares) at Jun. 30, 2019 12,974,287    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 4,483 4,483
Cash dividends declared 0 (2,250) (2,250)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 421 0 421
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 10,539    
Stock-based compensation $ 40 0 40
Stock-based compensation (in shares) 0    
Balance at Sep. 30, 2019 $ 82,644 49,164 131,808
Balance (in shares) at Sep. 30, 2019 12,984,826    
Balance at Dec. 31, 2019 $ 83,976 50,209 $ 134,185
Balance (in shares) at Dec. 31, 2019 13,014,898   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   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   13,049,237