Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

This unaudited quarterly information has been prepared on the same basis as our annual audited financial statements and includes all adjustments, consisting only of normal recurring adjustments that are necessary to present fairly the financial information for the fiscal quarters presented.



2018:	First Quarter	Second Quarter	Third Quarter	Fourth Quarter
Revenue	42,628	54,448	63,146	52,248
Cost of goods sold	35,413	34,678	40,595	34,217
Operating expenses	5,862	6,861	5,145	23,820
Net income	975	10,021	12,125	(4,433	)
Earnings per share, basic	0.02	0.25	0.30	(0.11	)
Earnings per share, diluted	0.02	0.25	0.30	(0.11	)



2017:	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Revenue	$	25,059	$	29,787	$	39,329	$	43,037
Cost of goods sold	19,662		21,407		26,297		32,938
Operating expenses	3,839		4,570		4,261		5,533
Net income	969		2,624		7,047		10,886
Earnings per share, basic	0.02		0.07		0.17		0.27
Earnings per share, diluted	0.02		0.06		0.17		0.27