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Note 4 - Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended |  |  | Six months ended |
|  | June 30, |  |  | June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Net income |  | $ | 8,766,017 |  |  | $ | 6,676,467 |  |  | $ | 17,950,982 |  |  | $ | 13,049,956 |
Basic EPS |  | $ | 0.67 |  |  | $ | 0.54 |  |  | $ | 1.36 |  |  | $ | 1.08 |
Diluted EPS |  | $ | 0.65 |  |  | $ | 0.53 |  |  | $ | 1.33 |  |  | $ | 1.07 |
Weighted average common shares outstanding |  |  | 13,170,283 |  |  |  | 12,335,077 |  |  |  | 13,151,833 |  |  |  | 12,064,349 |
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan |  |  | 346,309 |  |  |  | 181,397 |  |  |  | 350,672 |  |  |  | 170,863 |
Weighted average common and common equivalent shares outstanding |  |  | 13,516,592 |  |  |  | 12,516,474 |  |  |  | 13,502,505 |  |  |  | 12,235,212 |

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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://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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