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Note 2 - Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Weighted-average common shares outstanding |  |  | 2,251,365 |  |  |  | 2,231,165 |  |  |  | 2,206,392 |
Average treasury stock shares |  |  | (236,399 | ) |  |  | (189,530 | ) |  |  | (189,530 | )
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share |  |  | 2,014,966 |  |  |  | 2,041,635 |  |  |  | 2,016,862 |
Additional common stock equivalents used to calculate diluted earnings per share |  |  | 9,154 |  |  |  | 7,871 |  |  |  | 7,178 |
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share |  |  | 2,024,120 |  |  |  | 2,049,506 |  |  |  | 2,024,040 |

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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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