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Note 1 - Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule Of Estimated Useful Lives [Table Text Block] |
Buildings (in years) |  |  | 25 |  |
Leasehold improvements (in years) |  | 15 | - | 20 |
Machinery and equipment — manufacturing and drilling (in years) |  |  | 10 |  |
Machinery and equipment — computers (in years) |  | 3 | - | 5 |
Office equipment — furniture and fixtures (in years) |  | 5 | - | 15 |
Office equipment — other (in years) |  | 5 | - | 10 |
Automobiles (in years) |  | 5 | - | 7 |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (In thousands) |
Weighted average number of shares used in computation of basic earnings per share |  |  | 50,110 |  |  |  | 49,469 |  |  |  | 48,562 |
Add: |  |  |  |  |  |  |  |  |  |  |  |
Additional shares from the assumed exercise of employee stock options |  |  | 659 |  |  |  | 671 |  |  |  | 625 |
Weighted average number of shares used in computation of diluted earnings per share |  |  | 50,769 |  |  |  | 50,140 |  |  |  | 49,187 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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