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Note 7 - Stockholders' Equity (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Stock Options And Warrants Tables |  |
Summary of the warrant activity |
|  | Number of Warrants |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2018: |  |  | 1,813,053 |  |  | $ | 2.00 |
Granted |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |
Outstanding at March 31, 2019 |  |  | 1,813,053 |  |  | $ | 2.00 |
Exercisable at March 31, 2019 |  |  | 1,813,053 |  |  | $ | 2.00 |
|  | Number of Warrants |  |  | Weighted-Average Exercise Price |
Outstanding, December 31, 2016 |  |  | 15,550 |  |  |  | 135.00 |
Granted |  |  | 486,351 |  |  |  | 15.00 |
Exercised |  |  | (501,901 | ) |  |  | 15.00 |
Expired |  |  | - |  |  |  | - |
Outstanding, December 31, 2017 |  |  | - |  |  |  | - |
Granted |  |  | 1,813,053 |  |  |  | 2.00 |
Exercised |  |  | - |  |  |  |  |
Expired |  |  | - |  |  |  |  |
Outstanding, December 31, 2018 |  |  | 1,813,053 |  |  |  | 2.00 |
Exercisable Warrants: |  |  |  |  |  |  |  |
December 31, 2018 |  |  | 1,813,053 |  |  |  | 2.00 |
December 31, 2017 |  |  | - |  |  |  | - |
Summary of the stock option activity |
|  | Number of Options |  |  | Weighted Average Exercise Price |
Outstanding, December 31, 2018 |  |  | 1,133 |  |  | $ | 1,320.00 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |
Expired |  |  | - |  |  |  | - |
Outstanding, March 31, 2019 |  |  | 1,133 |  |  | $ | 1,320.00 |
Exercisable, March 31, 2019 |  |  | 1,133 |  |  | $ | 1,320.00 |
|  | Number of Options |  |  | Weighted-Average Exercise Price |
Outstanding, December 31, 2016 |  |  | 1,246 |  |  |  | 1,320.00 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |
Expired |  |  | - |  |  |  | - |
Outstanding, December 31, 2017 |  |  | 1,246 |  |  |  | 1,320.00 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |
Expired |  |  | (133 | ) |  |  | 1,020.00 |
Outstanding, December 31, 2018 |  |  | 1,113 |  |  |  | 1,320.00 |
Exercisable Options: |  |  |  |  |  |  |  |
December 31, 2018 |  |  | 1,113 |  |  |  | 1,320.00 |
December 31, 2017 |  |  | 1,246 |  |  |  | 1,428.00 |
Summary of outstanding and exercisable stock options |  |
|  |  |  | Outstanding Options |  |  | Exercisable Options |
| Range of Exercise Prices |  |  | Number of Options |  |  | Weighted-Average Remaining Contractual Life |  |  | Weighted-Average Exercise Price |  |  | Number of Options |  |  | Weighted-Average Exercise Price |
$750.00 to $2,225.00 |  |  | 1,113 |  |  |  | 0.49 |  |  | $ | 1,320.00 |  |  |  | 1,113 |  |  | $ | 1,320.00 |  |  |  |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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