Note 2 - Adoption of New Accounting Standard (Tables)

3 Months Ended

Mar. 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]

	Three Months Ended March 31, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments Due to ASC 606			As Reported
Operating revenue	$	187,055	$	(95	)	$	186,960
Operating expenses:
Salaries, wages and benefits		58,758		64			58,822
Purchased transportation		34,823		203			35,026
Fuel and fuel taxes		29,043		1			29,044
Supplies and maintenance		10,411		25			10,436
Income taxes expense		3,559		(107	)		3,452
Net income		10,612		(281	)		10,331

	Balance at March 31, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments Due to ASC 606			As Reported
Assets:
Prepaid expenses and other	$	16,836	$	2,350	(a)	$	19,186
Liabilities:
Accounts payable and accrued liabilities		47,275		2,146			49,421
Stockholders’ equity:
Retained earnings		457,789		204			457,993