Note 8 - Stock Options and Warrants (Tables)
|
6 Months Ended |
12 Months Ended |
Jun. 30, 2019 |
Dec. 31, 2018 |
Equity [Abstract] |
|
|
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 |
|
|
(1,133 |
) |
|
|
1,320.00 |
|
Outstanding,
June 30, 2019 |
|
|
- |
|
|
$ |
- |
|
Exercisable,
June 30, 2019 |
|
|
- |
|
|
$ |
- |
|
|
|
|
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 the warrant activity |
|
|
Number
of Warrants |
|
|
Weighted
Average Exercise Price |
|
Outstanding
at December 31, 2018: |
|
|
1,813,053 |
|
|
$ |
0.35 |
|
Granted |
|
|
- |
|
|
|
- |
|
Forfeited |
|
|
- |
|
|
|
- |
|
Exercised |
|
|
- |
|
|
|
- |
|
Outstanding
at June 30, 2019 |
|
|
1,813,053 |
|
|
$ |
0.35 |
|
Exercisable
at June 30, 2019 |
|
|
1,813,053 |
|
|
$ |
0.35 |
|
|
|
|
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 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 |
|
|
|
|
|