Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING REVENUES:
Operating revenues	$ 129,155	$ 128,686
OPERATING EXPENSES AND COSTS:
Salaries, wages and benefits	32,798	31,063
Operating supplies and expenses	23,715	23,512
Rent and purchased transportation	42,927	44,554
Depreciation	14,295	13,187
Insurance and claims	42	4,114
Other	5,844	2,994
Loss/(gain) on disposition of equipment	48	(425)
Total operating expenses and costs	119,669	118,999
OPERATING INCOME	9,486	9,687
NON-OPERATING (EXPENSE)/INCOME	(9,076)	3,472
INTEREST EXPENSE	(2,212)	(2,040)
(LOSS)/INCOME BEFORE INCOME TAXES	(1,802)	11,119
FEDERAL AND STATE INCOME TAX (BENEFIT) EXPENSE:
Current		89
Deferred	(498)	2,729
Total federal and state income tax (benefit) expense	(498)	2,818
NET (LOSS)/INCOME	$ (1,304)	$ 8,301
(LOSS) INCOME PER COMMON SHARE:
Basic (in dollars per share)	$ (0.23)	$ 1.40
Diluted (in dollars per share)	$ (0.23)	$ 1.39
AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	5,746	5,921
Diluted (in shares)	5,746	5,985
Freight Transportation Service [Member]
OPERATING REVENUES:
Operating revenues	$ 111,822	$ 110,345
Fuel Surcharge [Member]
OPERATING REVENUES:
Operating revenues	$ 17,333	$ 18,341