Note 8 - Equity - Warrants (Details) - Goods and Services Exchanged for Equity Instrument [Member] - Warrant [Member] - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Unvested (in shares) | 90,000 | 90,000 | |
| Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 8.13 | $ 8.13 | |
| Outstanding, Weighted Average Remaining Contractual Term (Year) | 328 days | 1 year 328 days | 2 years 328 days |
| Granted, Number of Units (in shares) | |||
| Granted, Weighted Average Exercise Price (in dollars per share) | |||
| Unvested (in shares) | 90,000 | 90,000 | 90,000 |
| Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 8.13 | $ 8.13 | $ 8.13 |
| Exercisable, Number of Units (in shares) | 90,000 | ||
| Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 8.13 | ||
| Exercisable, Weighted Average Remaining Contractual Term | 0.9 | ||
| X | ||||||||||
- Definition The number of shares into which fully or partially vested equity instruments other than option outstanding as of the balance sheet date can be currently converted under the option plan. No definition available.
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| X | ||||||||||
- Definition Weighted average remaining contractual term for exercisable equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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| X | ||||||||||
- Definition The weighted average exercise price of exercisable awards on equity-based plans excluding option plans. No definition available.
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| X | ||||||||||
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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