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Note 4 - Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 1,629,353 |  |  | $ | 1,539,638 |  |  | $ | 3,215,674 |  |  | $ | 3,113,744 |
Numerator for basic and diluted earnings per share |  |  | 1,629,353 |  |  |  | 1,539,638 |  |  |  | 3,215,674 |  |  |  | 3,113,744 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding-basic |  |  | 10,167,649 |  |  |  | 10,156,442 |  |  |  | 10,165,060 |  |  |  | 10,156,442 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | 48,886 |  |  |  | 15,729 |  |  |  | 40,379 |  |  |  | 16,119 |
Dilutive potential common shares |  |  | 48,886 |  |  |  | 15,729 |  |  |  | 40,379 |  |  |  | 16,119 |
Denominator for diluted earnings per share-weighted-average shares |  |  | 10,216,535 |  |  |  | 10,172,171 |  |  |  | 10,205,439 |  |  |  | 10,172,561 |
Basic earnings per share |  | $ | 0.16 |  |  | $ | 0.15 |  |  | $ | 0.32 |  |  | $ | 0.30 |
Diluted earnings per share |  | $ | 0.16 |  |  | $ | 0.15 |  |  | $ | 0.32 |  |  | $ | 0.30 |

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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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