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Note 4 - Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  |  | Three Months Ended |  |  | Nine Months Ended |
|  |  | September 30, |  |  | September 30, |
|  |  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income |  | $ | 1,628,562 |  |  | $ | 1,561,832 |  |  | $ | 5,248,459 |  |  | $ | 4,777,506 |
| Numerator for basic and diluted earnings per share |  |  | 1,628,562 |  |  |  | 1,561,832 |  |  |  | 5,248,459 |  |  |  | 4,777,506 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Weighted-average shares outstanding-basic |  |  | 10,203,711 |  |  |  | 10,176,744 |  |  |  | 10,200,411 |  |  |  | 10,163,490 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Stock options |  |  | 36,294 |  |  |  | 44,768 |  |  |  | 38,133 |  |  |  | 41,858 |
| Restricted stock |  |  | 1,405 |  |  |  | - |  |  |  | 1,565 |  |  |  |  |
Dilutive potential common shares |  |  | 37,699 |  |  |  | 44,768 |  |  |  | 39,698 |  |  |  | 41,858 |
| Denominator for diluted earnings per share-weighted-average shares |  |  | 10,241,410 |  |  |  | 10,221,512 |  |  |  | 10,240,109 |  |  |  | 10,205,348 |
| Basic earnings per share |  | $ | 0.16 |  |  | $ | 0.15 |  |  | $ | 0.51 |  |  | $ | 0.47 |
| Diluted earnings per share |  | $ | 0.16 |  |  | $ | 0.15 |  |  | $ | 0.51 |  |  | $ | 0.47 |

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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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