Quarterly Data - Unaudited (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Quarterly financial information

Financial information for each quarter of 2020 and 2019 is as follows:

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

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