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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Years ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Weighted average shares outstanding – basic |  |  | 107,329 |  |  |  | 109,375 |  |  |  | 109,987 |
Effect of common stock equivalents |  |  | 978 |  |  |  | 1,053 |  |  |  | 1,062 |
Weighted average shares outstanding – diluted |  |  | 108,307 |  |  |  | 110,428 |  |  |  | 111,049 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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