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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 4,002 4,002
Cash dividends declared 0 (2,346) (2,346)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 411 0 411
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 9,289    
Stock-based compensation $ 37 0 37
Stock-based compensation (in shares) 0    
Balance at Mar. 31, 2020 $ 84,424 51,865 136,289
Balance (in shares) at Mar. 31, 2020 13,024,187    
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 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   13,071,733