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Note 11 - Basic and Diluted Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended June 30, 2015 |  |  | Three months ended June 30, 2014 |  |  | Six months ended June 30, 2015 |  |  | Six months ended June 30, 2014 |
Numerator for basic and diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period |  | $ | 2,284,995 |  |  | $ | 1,347,182 |  |  | $ | 5,118,938 |  |  | $ | 1,824,021 |
Denominator for basic and diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average number of common shares outstanding |  |  | 11,047,136 |  |  |  | 11,219,101 |  |  |  | 11,094,618 |  |  |  | 11,124,357 |
Effect of outstanding stock options |  |  | 409,534 |  |  |  | 510,446 |  |  |  | 423,487 |  |  |  | 560,172 |
Diluted weighted average number of shares outstanding |  |  | 11,456,670 |  |  |  | 11,729,547 |  |  |  | 11,518,105 |  |  |  | 11,684,529 |
Basic earnings per common share |  | $ | 0.21 |  |  | $ | 0.12 |  |  | $ | 0.46 |  |  | $ | 0.16 |
Diluted earnings per common share |  | $ | 0.20 |  |  | $ | 0.11 |  |  | $ | 0.44 |  |  | $ | 0.16 |

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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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