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Note 9 - Basic and Diluted Earnings Per Common 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 June 30, |  |  | Six months ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Numerator for basic and diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period |  | $ | 5,241,484 |  |  | $ | 4,070,786 |  |  | $ | 7,687,975 |  |  | $ | 8,509,024 |
Denominator for basic and diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average number of common shares outstanding |  |  | 10,528,219 |  |  |  | 10,541,659 |  |  |  | 10,501,407 |  |  |  | 10,607,843 |
Effect of outstanding stock options |  |  | 264,812 |  |  |  | 192,201 |  |  |  | 284,278 |  |  |  | 189,615 |
Diluted weighted average number of shares outstanding |  |  | 10,793,031 |  |  |  | 10,733,860 |  |  |  | 10,785,685 |  |  |  | 10,797,458 |
Basic earnings per common share |  | $ | 0.50 |  |  | $ | 0.39 |  |  | $ | 0.73 |  |  | $ | 0.80 |
Diluted earnings per common share |  | $ | 0.49 |  |  | $ | 0.38 |  |  | $ | 0.71 |  |  | $ | 0.79 |

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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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