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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Notes Tables |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | 20 17 |  |  | 20 16 |  |  | 20 15 |
Average number of common shares outstanding |  |  | 6,957,974 |  |  |  | 6,957,974 |  |  |  | 6,953,849 |
Effect of dilutive options |  |  | --- |  |  |  | --- |  |  |  | 3,245 |
Average number of common shares outstanding used to calculate diluted earnings per common share |  |  | 6,957,974 |  |  |  | 6,957,974 |  |  |  | 6,957,094 |

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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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