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Note 10 - Segment Information, Significant Customers, Industry Concentration and Geographic Areas (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | (in thousands) |
|  | Amount |  |  | Percent |  |  | Amount |  |  | Percent |  |  | Amount |  |  | Percent |
United States - domestic shipments |  | $ | 326,559 |  |  |  | 63.5 |  |  | $ | 302,754 |  |  |  | 56.8 |  |  | $ | 255,197 |  |  |  | 58.3 |
Shipments to or from Mexico |  |  | 186,391 |  |  |  | 36.3 |  |  |  | 229,350 |  |  |  | 43.0 |  |  |  | 181,099 |  |  |  | 41.4 |
Shipments to or from Canada |  |  | 1,226 |  |  |  | 0.2 |  |  |  | 1,157 |  |  |  | 0.2 |  |  |  | 1,542 |  |  |  | 0.3 |
Total Operating Revenues |  | $ | 514,177 |  |  |  | 100 | % |  | $ | 533,261 |  |  |  | 100 | % |  | $ | 437,838 |  |  |  | 100 | %

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