P.A.M. Transportation Services, Inc. announced earnings results for the fourth quarter ended December 31, 2018. For the fourth quarter, the company announced total revenue was USD 138.174 million compared to USD 110.889 million a year ago. Operating income was USD 14.675 million compared to USD 3.352 million a year ago. Net income was USD 6.070 million compared to USD 31.561 million a year ago. Diluted earnings per share was USD 1.01 compared to USD 5 a year ago. For the full year, total revenue was USD 533.261 million compared to USD 437.838 million a year ago. Operating income was USD 41.602 million compared to USD 12.680 million a year ago. Net income was USD 23.994 million compared to USD 38.899 million a year ago. Diluted earnings per share was USD 3.9 compared to USD 6.08 a year ago.