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Quarterly Data - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial information

Financial information for each quarter of 2019 and 2018 is as follows:

(Thousands of Dollars, Except per Share Data)

2019

1st

2nd

3rd

4th

Total

 

Operating Revenues

$

30,698

$

33,393

$

37,769

$

32,738

$

134,598

Operating Income

7,028

8,950

11,983

7,559

35,520

Net Income

6,552

8,146

11,119

8,071

33,888

Basic Earnings per Share

$

0.40

$

0.49

$

0.67

$

0.46

$

2.02

Diluted Earnings per Share

$

0.39

$

0.49

$

0.67

$

0.46

$

2.01

Common Dividend Per Share

$

0.2400

$

0.2400

$

0.2400

$

0.2563

$

0.9763

High/Low Common Stock Price

$

60.48/$51.02

$

63.68/$52.51

$

66.10/$55.30

$

67.69/$58.75

2018

1st

2nd

3rd

4th

Total

 

Operating Revenues

$

31,177

$

34,919

$

38,713

$

33,268

$

138,077

Operating Income

6,350

10,721

12,918

7,153

37,142

Net Income

4,494

8,675

12,290

6,993

32,452

Basic Earnings per Share

$

0.27

$

0.52

$

0.75

$

0.43

$

1.97

Diluted Earnings per Share

$

0.27

$

0.52

$

0.74

$

0.43

$

1.96

Common Dividend Per Share

$

0.2238

$

0.2238

$

0.2238

$

0.2400

$

0.9114

High/Low Common Stock Price

$

41.45/$33.96

$

45.24/$34.74

$

49.00/$41.77

$

60.31/$43.12