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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
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.
2019:First QuarterSecond QuarterThird QuarterFourth Quarter
Revenue$51,775  $67,941  $65,690  $47,667  
Cost of goods sold40,605  43,068  38,555  29,793  
Operating expenses5,219  5,668  12,687  13,995  
Net income4,033  14,276  10,926  2,388  
Earnings per share, basic0.10  0.36  0.27  0.06  
Earnings per share, diluted0.10  0.36  0.27  0.05  

2018:First QuarterSecond QuarterThird QuarterFourth Quarter
Revenue$42,628  $54,448  $63,146  $52,248  
Cost of goods sold35,413  34,678  40,595  34,217  
Operating expenses5,862  6,861  5,145  23,820  
Net income 975  10,021  12,125  (4,433) 
Earnings per share, basic0.02  0.25  0.30  (0.11) 
Earnings per share, diluted0.02  0.25  0.30  (0.11)