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Stock options (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Options |  |  |
Outstanding at beginning | 5,004,167 | 4,167 | 1,154,167
Granted | 5,000,000 | 5,000,000 |
Exercised | 4,167 |  |
Outstanding at ending | 10,000,000 | 5,004,167 |
Weighted-Average Exercise Price |  |  |
Weighted average exercise price beginning | $ 0.33 | $ 3.12 |
Exercise Price granted | 0.35 | 0.33 |
Cancelled or Exercised | 3.12 |  |
Weighted average exercise price ending | $ 0.34 | $ 0.33 |

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- Definition Number of options outstanding, including both vested and non-vested options. + 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 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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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