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Note 5 - Share-based Compensation - Stock Option Activity (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Outstanding, shares (in shares) |  | 4,638,390 |  |  |
Outstanding, weighted average exercise price (in dollars per share) |  | $ 2.44 |  |  |
Weighted-average remaining contractual term, outstanding (Year) |  | 6 years 10 days |  |  | 5 years 7 months 20 days
Aggregate intrinsic value, outstanding |  | $ 14,209,431 |  |  | $ 13,701,610
Granted, shares (in shares) | [1] | 745,825 |  |  |
Granted, weighted average exercise price (in dollars per share) | [1] | $ 5.25 |  |  |
Exercised, shares (in shares) | [2] | (60,000) |  |  |
Exercised, weighted average exercise price (in dollars per share) |  | $ 1.93 | [2] | $ 1.78 |
Expired, shares (in shares) |  | 0 |  |  |
Expired, weighted average exercise price (in dollars per share) |  | $ 0 |  |  |
Canceled, shares (in shares) |  | 0 |  |  |
Canceled, weighted average exercise price (in dollars per share) |  | $ 0 |  |  |
Outstanding, shares (in shares) |  | 5,324,215 |  |  | 4,638,390
Outstanding, weighted average exercise price (in dollars per share) |  | $ 2.84 |  |  | $ 2.44
Exercisable, shares (in shares) |  | 4,016,141 |  |  |
Exercisable, weighted average exercise price (in dollars per share) |  | $ 2.28 |  |  |
Weighted-average remaining contractual term, exercisable (Year) |  | 5 years 1 month 2 days |  |  |
Aggregate intrinsic value, exercisable |  | $ 12,927,908 |  |  |
[1] | Represents the following stock options granted: Annual share-based compensation awards on January 4, 2021, including: (a) 417,500 stock options with an exercise price of $5.16 per share granted to executives and key personnel, upon one year anniversary, or vesting annually in equal installments over four years, (b) 227,500 stock options with an exercise price of $5.16 per share granted to members of the Board of Directors, vesting upon one year anniversary, (c) 23,325 stock options with an exercise price of $5.16 per share granted to employees, vesting annually in equal installments over four years and (d) 5,000 stock options with an exercise price of $5.16 per share granted to a consultant, vesting upon one year anniversary. One-time award on January 8, 2021, 35,000 stock options with an exercise price of $5.50 per share granted to a new member of the Board of Directors, vesting in one year from the grant date. One-time award on January 21, 2021, 7,500 stock options with an exercise price of $5.65 per share granted to a consultant, vesting in one year from the grant date. One-time award on March 22, 2021, 30,000 stock options with an exercise price of $6.87 per share granted to a consultant, vesting in one year from the grant date.
[2] | Represents the following stock options exercised: A total of 60,000 stock options exercised with a weighted average exercise price of $1.93.

X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=120381028&loc=d3e5070-113901 + Details
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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=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)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=120381028&loc=d3e5070-113901 + Details
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