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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, 2021
Notes Tables |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | (in thousands) |
|  | Amount |  |  | Percent |  |  | Amount |  |  | Percent |  |  | Amount |  |  | Percent |
United States - domestic shipments |  | $ | 474,291 |  |  |  | 67.9 |  |  | $ | 316,542 |  |  |  | 66.1 |  |  | $ | 326,559 |  |  |  | 63.5 |
Shipments to or from Mexico |  |  | 223,315 |  |  |  | 32.0 |  |  |  | 161,412 |  |  |  | 33.7 |  |  |  | 186,392 |  |  |  | 36.3 |
Shipments to or from Canada |  |  | 891 |  |  |  | 0.1 |  |  |  | 1,156 |  |  |  | 0.2 |  |  |  | 1,226 |  |  |  | 0.2 |
Total Operating Revenues |  | $ | 698,497 |  |  |  | 100 | % |  | $ | 479,110 |  |  |  | 100 | % |  | $ | 514,177 |  |  |  | 100 | %

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