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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Years ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Weighted average shares outstanding – basic |  |  | 112,474 |  |  |  | 115,677 |  |  |  | 117,000 |
Effect of common stock equivalents |  |  | 887 |  |  |  | 1,051 |  |  |  | 1,445 |
Weighted average shares outstanding – diluted |  |  | 113,361 |  |  |  | 116,728 |  |  |  | 118,445 |

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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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