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Note 4 - Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended December 31, |
(in thousands, except share and per share amounts) |  | 2018 |  |  | 2017 |  |  | 2016 |
Net Income |  | $ | 76,588 |  |  | $ | 51,778 |  |  | $ | 42,707 |
Basic - weighted-average shares outstanding: |  |  | 26,982,614 |  |  |  | 26,647,610 |  |  |  | 26,365,173 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options and other |  |  | 296,202 |  |  |  | 197,461 |  |  |  | 199,466 |
Diluted - weighted-average shares outstanding: |  |  | 27,278,816 |  |  |  | 26,845,071 |  |  |  | 26,564,639 |
Net income per share attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.84 |  |  | $ | 1.94 |  |  | $ | 1.62 |
Diluted |  | $ | 2.81 |  |  | $ | 1.93 |  |  | $ | 1.61 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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