Note 7 - Stockholders' Equity (Details 2) - $ / shares |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2018 |
Mar. 31, 2019 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Stock Options And Warrants Details | ||||
| Exercise price range | $750.00 to $2,225.00 | |||
| Number of options outstanding, ending | 1,113 | 1,246 | 1,246 | |
| Weighted average remaining contractual life | 5 months 26 days | |||
| Weighted average exercise price, outstanding | $ 1,320.00 | $ 1,320.00 | $ 1,428.00 | |
| Number of options exercisable | 1,113 | 1,133 | 1,246 | |
| Weighted average exercise price, exercisable | $ 1,320.00 | $ 1,320.00 | $ 1,428.00 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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