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Note 6 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |
Risk-Free interest rate |  |  | 0.25% - 1.72% |  |  |  | 1.69% - 2.50% |
Expected dividend yield |  |  | — | % |  |  | — | %
Expected stock price volatility |  |  | 39.94% - 51.22% |  |  |  | 28.59% - 37.29% |
Expected life of options (years) |  |  | 1.75 - 6.25 Years |  |  |  | 2 - 6.25 Years |
Discount for lack of marketability |  |  | — | % |  |  | 0 - 8.48 | %
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted- |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Average |  |  |  |  |
|  |  |  |  |  | Weighted- |  |  | Remaining |  |  | Aggregate |
|  |  |  |  |  | Average |  |  | Contractual |  |  | Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Term (Years) |  |  | Value |
Outstanding at December 31, 2018 |  |  | 3,552,890 |  |  | $ | 1.57 |  |  |  | 5.06 |  |  | $ | 1,149,461 |
Granted |  |  | 1,089,000 |  |  |  | 2.26 |  |  |  |  |  |  |  |  |
Exercised |  |  | (781,500 | ) |  |  | 1.60 |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Canceled |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2019 |  |  | 3,860,390 |  |  | $ | 1.76 |  |  |  | 5.69 |  |  | $ | 13,287,932 |
Granted (1) |  |  | 913,000 |  |  |  | 5.24 |  |  |  |  |  |  |  |  |
Exercised (2) |  |  | (135,000 | ) |  |  | 1.89 |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Canceled |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2020 |  |  | 4,638,390 |  |  | $ | 2.44 |  |  |  | 5.64 |  |  | $ | 13,701,610 |
Exercisable at December 31, 2020 |  |  | 3,284,794 |  |  | $ | 1.78 |  |  |  | 4.47 |  |  | $ | 11,886,680 |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |
General and administrative |  | $ | 1,466,461 |  |  | $ | 1,069,152 |
Research and development |  |  | 185,432 |  |  |  | 101,927 |
Total |  | $ | 1,651,893 |  |  | $ | 1,171,079 |

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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