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Note 2 - Adoption of New Accounting Standard (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Cumulative Effect of Adjustments for New Accounting Pronouncements on Balance Sheet [Table Text Block]

(In thousands)		Balance at December 31, 2017				Adjustments due to ASC 606				Balance at January 1, 2018
Assets:
Prepaid expenses and other		$	19,810			$	2,445	(a)		$	22,255
Liabilities:
Accounts payable and accrued liabilities			38,100				1,960				40,060
Stockholders’ equity:
Retained earnings			448,542				485				449,027

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

		Year Ended December 31, 2018
(In thousands)		Prior to Adoption of ASC 606				Adjustments due to ASC 606				As Reported
Operating revenue		$	788,216			$	(622	)		$	787,594
Operating expenses:
Salaries, wages and benefits			252,327				(280	)			252,047
Purchased transportation			144,573				38				144,611
Fuel and fuel taxes			121,666				(33	)			121,633
Supplies and maintenance			40,832				21				40,853
Income taxes expense			16,121				(119	)			16,002
Net income			55,276				(249	)			55,027

		Balance at December 31, 2018
(In thousands)		Prior to Adoption of ASC 606				Adjustments due to ASC 606				As Reported
Assets:
Prepaid expenses and other		$	18,101			$	1,823	(a)		$	19,924
Liabilities:
Accounts payable and accrued liabilities			42,283				1,587				43,870
Stockholders’ equity:
Retained earnings			498,359				236				498,595

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