Note 2 - Adoption of New Accounting Standard (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments Due to ASC 606			As Reported
Operating revenue	$	197,113	$	(89	)	$	197,024
Operating expenses:
Salaries, wages and benefits		63,262		(12	)		63,250
Purchased transportation		35,106		(58	)		35,048
Fuel and fuel taxes		31,740		2			31,742
Supplies and maintenance		10,300		(49	)		10,251
Income taxes expense		4,652		7			4,659
Net income		13,681		21			13,702

	Six Months Ended June 30, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments Due to ASC 606			As Reported
Operating revenue	$	384,168	$	(184	)	$	383,984
Operating expenses:
Salaries, wages and benefits		122,020		52			122,072
Purchased transportation		69,929		145			70,074
Fuel and fuel taxes		60,783		3			60,786
Supplies and maintenance		20,711		(24	)		20,687
Income taxes expense		8,211		(100	)		8,111
Net income		24,293		(260	)		24,033

	Balance at June 30, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments Due to ASC 606			As Reported
Assets:
Prepaid expenses and other	$	17,615	$	2,261	(a)	$	19,876
Liabilities:
Accounts payable and accrued liabilities		43,746		2,036			45,782
Stockholders’ equity:
Retained earnings		470,104		225			470,329