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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 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    
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    
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 8,888 $ 8,888
Cash dividends declared 0 (5,335) (5,335)
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 $ 881 0 881
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 21,856    
Stock-based compensation $ 158 0 158
Stock-based compensation (in shares) 8,019    
Balance at Jun. 30, 2022 $ 133,239 67,945 $ 201,184
Balance (in shares) at Jun. 30, 2022 14,264,763   14,264,763
Balance at Mar. 31, 2022 $ 88,725 65,695 $ 154,420
Balance (in shares) at Mar. 31, 2022 13,123,619    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 5,029 5,029
Cash dividends declared 0 (2,779) (2,779)
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 $ 431 0 431
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 11,185    
Stock-based compensation $ 113 0 113
Stock-based compensation (in shares) 8,019    
Balance at Jun. 30, 2022 $ 133,239 $ 67,945 $ 201,184
Balance (in shares) at Jun. 30, 2022 14,264,763   14,264,763