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Note 11 - Capital Stock - Summary of Warrant Activity (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Outstanding (in shares) | 105,556 |
Outstanding (in shares) | 105,556 | 105,556
Outstanding, weighted average exercise price (in dollars per share) | $ 9.95 |
Outstanding, weighted average exercise price (in dollars per share) | $ 9.95 | $ 9.95
Outstanding, weighted average remaining contractual life (Year) | 5 years 273 days | 6 years 182 days
Outstanding, aggregate intrinsic value of vested warrants | $ 1,042,893 | $ 1,419,728

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: 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)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: 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 + Details
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