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Note 4 - Earnings Per 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 |
Net income |  | $ | 10,549,961 |  |  | $ | 9,184,965 |
Basic EPS |  | $ | 0.76 |  |  | $ | 0.70 |
Diluted EPS |  | $ | 0.74 |  |  | $ | 0.68 |
Weighted average common shares outstanding |  |  | 13,888,661 |  |  |  | 13,133,382 |
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan |  |  | 316,923 |  |  |  | 355,035 |
Weighted average common and common equivalent shares outstanding |  |  | 14,205,584 |  |  |  | 13,488,417 |

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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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