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Note 13 - Net Income Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 40,653 |  |  | $ | 32,113 |
Denominator: |  |  |  |  |  |  |  |
Weighted average common shares outstanding - basic |  |  | 5,702,539 |  |  |  | 5,671,838 |
Effect of dilutive equity awards (1) |  |  | 40,109 |  |  |  | 59,063 |
Weighted average common shares outstanding - diluted |  |  | 5,742,648 |  |  |  | 5,730,901 |
Net income per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 7.13 |  |  | $ | 5.66 |
Diluted |  | $ | 7.08 |  |  | $ | 5.60 |

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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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