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Quarterly Data - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial information

Financial information for each quarter of 2021 and 2020 is as follows:

(Thousands of Dollars, Except per Share Data)

2021

1st

2nd

3rd

4th

Total

 

Operating Revenues

$

32,541

$

36,701

$

39,874

$

34,025

$

143,141

Operating Income

5,634

9,814

11,424

6,339

33,211

Net Income

6,907

10,923

11,476

7,237

36,543

Basic Earnings per Share

$

0.39

$

0.62

$

0.65

$

0.42

$

2.08

Diluted Earnings per Share

$

0.39

$

0.62

$

0.65

$

0.41

$

2.07

Common Dividend Per Share

$

0.2725

$

0.2725

$

0.2725

$

0.2900

$

1.1075

High/Low Common Stock Price

$

85.92/$67.09

$

88.61/$77.31

$

116.40/$81.02

$

119.37/$98.12

2020

1st

2nd

3rd

4th

Total

 

Operating Revenues

$

31,769

$

35,277

$

39,920

$

34,626

$

141,592

Operating Income

6,527

9,385

13,177

8,331

37,420

Net Income

7,668

9,713

12,737

8,307

38,425

Basic Earnings per Share

$

0.44

$

0.55

$

0.73

$

0.47

$

2.19

Diluted Earnings per Share

$

0.44

$

0.55

$

0.72

$

0.47

$

2.18

Common Dividend Per Share

$

0.2563

$

0.2563

$

0.2563

$

0.2725

$

1.0414

High/Low Common Stock Price

$

69.92/$48.79

$

72.41/$53.70

$

69.89/$59.61

$

76.08/$61.81