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Note 2 - Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted-average common shares outstanding |  |  | 3,415,115 |  |  |  | 2,494,022 |  |  |  | 2,251,365 |
Average treasury stock shares |  |  | (386,165 | ) |  |  | (386,165 | ) |  |  | (236,399 | )
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share |  |  | 3,028,950 |  |  |  | 2,107,857 |  |  |  | 2,014,966 |
Additional common stock equivalents (stock options) used to calculate diluted earnings per share |  |  | 23,635 |  |  |  | 11,357 |  |  |  | 9,154 |
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share |  |  | 3,052,585 |  |  |  | 2,119,214 |  |  |  | 2,024,120 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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