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Note 10 - Net Income 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] |
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Basic weighted average common shares outstanding during the year |  |  | 7,248 |  |  |  | 7,190 |  |  |  | 7,102 |
Weighted average common equivalent shares due to stock options and restricted stock units |  |  | 89 |  |  |  | 85 |  |  |  | 104 |
Diluted weighted average common shares outstanding during the year |  |  | 7,337 |  |  |  | 7,275 |  |  |  | 7,206 |

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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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