Note 7 - Other Equity - Stock Option Transactions (Details) |
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2018
USD ($)
|
Sep. 30, 2017
USD ($)
|
|
| Statement Line Items [Line Items] | ||
| Outstanding, Beginning of period | 2,344,000 | 2,005,000 |
| Outstanding, Beginning of period, weighted average exercise price | $ 3.46 | $ 4.31 |
| Stock options, granted | 2,284,000 | 780,000 |
| Stock options, weighted average exercise price, granted | $ 2.99 | $ 1.14 |
| Stock options, exercised | (96,000) | |
| Stock options, weighted average exercise price, exercised | $ 2.28 | |
| Stock options, forfeited | (51,000) | (165,000) |
| Stock options, weighted average exercise price, forfeited | $ 2.34 | $ 3.34 |
| Stock options, expired | (10,000) | (320,000) |
| Stock options, weighted average exercise price, expired | $ 4.97 | $ 4.60 |
| Outstanding, end of period | 4,471,000 | 2,300,000 |
| Outstanding, end of period, weighted average exercise price | $ 3.21 | $ 3.52 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The number of share options outstanding in a share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The number of share options exercised in a share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The number of share options expired in a share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The number of share options forfeited in a share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The number of share options granted in a share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The weighted average exercise price of share options exercised in a share-based payment arrangement. [Refer: Weighted average [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The weighted average exercise price of share options expired in a share-based payment arrangement. [Refer: Weighted average [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The weighted average exercise price of share options forfeited in a share-based payment arrangement. [Refer: Weighted average [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|