Note 6 - Earnings Per Share - Earnings Per Share (Details) - shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Weighted average shares outstanding, basic (in shares) | 161,592,569 | 155,422,384 | 151,180,222 |
| Dilutive shares related to warrants (in shares) | 4,273,889 | ||
| Unvested restricted stock (in shares) | 150,000 | ||
| Weighted average shares outstanding, diluted (in shares) | 166,016,458 | 155,422,384 | 151,180,222 |
| X | ||||||||||
- Definition Represents the dilutive effect of shares related to warrants. No definition available.
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| X | ||||||||||
- Definition Represents the dilutive effect of nonvested restricted stock. No definition available.
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| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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