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Note 4 - Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended |  |  | Nine months ended |
|  | September 30, |  |  | September 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Net income |  | $ | 7,853,935 |  |  | $ | 6,107,501 |  |  | $ | 25,804,917 |  |  | $ | 19,157,457 |
Basic EPS |  | $ | 0.60 |  |  | $ | 0.47 |  |  | $ | 1.96 |  |  | $ | 1.55 |
Diluted EPS |  | $ | 0.58 |  |  | $ | 0.46 |  |  | $ | 1.91 |  |  | $ | 1.52 |
Weighted average common shares outstanding* |  |  | 13,151,350 |  |  |  | 13,066,777 |  |  |  | 13,151,672 |  |  |  | 12,398,491 |
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan |  |  | 356,605 |  |  |  | 202,926 |  |  |  | 357,894 |  |  |  | 181,551 |
Weighted average common and common equivalent shares outstanding |  |  | 13,507,955 |  |  |  | 13,269,703 |  |  |  | 13,509,566 |  |  |  | 12,580,042 |

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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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