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Note 20 - Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating revenue	$ 227,333	$ 216,011	$ 212,384	$ 218,646	$ 217,185	$ 214,973	$ 212,090	$ 199,023	$ 874,374	$ 843,271	$ 787,594
Operating income	25,558	24,400	25,256	18,032	18,787	20,034	19,944	17,733	93,246	76,498	70,348
Net income	$ 19,604	$ 18,044	$ 18,134	$ 13,718	$ 15,748	$ 16,587	$ 15,190	$ 13,546	$ 69,500	$ 61,071	$ 55,027
Basic earnings per common share (in dollars per share)	$ 0.24	$ 0.22	$ 0.22	$ 0.17	$ 0.19	$ 0.20	$ 0.19	$ 0.17	$ 0.84	$ 0.75	$ 0.67
Diluted earnings per common share (in dollars per share)	$ 0.24	$ 0.22	$ 0.22	$ 0.17	$ 0.19	$ 0.20	$ 0.18	$ 0.16	$ 0.84	$ 0.74	$ 0.67

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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