Note 12 - Common stock warrants (Details) |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2017
USD ($)
$ / shares
shares
|
Dec. 31, 2016
USD ($)
$ / shares
shares
|
|
| Details | ||
| Warrants issued, Average Contractual Life in Years | 20.5 | 21.5 |
| Weighted Average outstanding warrant exercise price | $ / shares | $ 2.11 | $ 2.02 |
| Warrants exercised in period, Total | 1,544,883 | 4,503,346 |
| Warrants issued in period, Total | 0 | 0 |
| Warrants issued in period, Intrinsic Value | $ | $ 0 | $ 4,275 |
| X | ||||||||||
- Definition Represents the Warrants exercised in period, Total (number of shares), during the indicated time period. No definition available.
|
| X | ||||||||||
- Definition Represents the Warrants issued, Average Contractual Life in Years, as of the indicated date. No definition available.
|
| X | ||||||||||
- Definition Represents the monetary amount of Warrants issued in period, Intrinsic Value, as of the indicated date. No definition available.
|
| X | ||||||||||
- Definition Represents the Warrants issued in period, Total (number of shares), during the indicated time period. No definition available.
|
| X | ||||||||||
- Definition Represents the per-share monetary value of Weighted Average outstanding warrant exercise price, as of the indicated date. No definition available.
|
| X | ||||||||||
- References No definition available.
|