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Note 9 - Stockholders' Equity (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 23, 2021 | Jun. 30, 2020 | Apr. 30, 2020 | Jun. 30, 2011 | Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.95 |  |  | $ 2.15 | $ 2.15 | $ 1.95 | $ 1.97 | $ 0.50
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares) |  | 2,519,630 |  |  | 2,408,151 | 2,408,151 | 2,519,630 | 2,428,329 | 2,375,760
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Amount Capitalized |  |  |  |  |  | $ 286,000 | $ 48,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  | $ 3.5 | $ 3.5 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 4 years 4 months 24 days |  |  |
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  | 2,032,175 | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum |  |  |  |  |  | 0.19% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum |  |  |  |  |  | 1.15% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum |  |  |  |  |  | 69.10% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum |  |  |  |  |  | 94.00% |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 4,800 | $ 15,000 | $ 7,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  |  |  |  | 0.00% |  |  |
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Employee [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  | $ 3.79 | $ 3.79 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  |  |  |  | 6 years 6 months |  |  |
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Employee [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  | 2.46 | $ 2.46 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  |  |  |  | 3 years |  |  |
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  | 16,666 | 8,333 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum |  |  |  |  |  | 86.97% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum |  |  |  |  |  | 94.05% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  |  |  |  | 5 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  |  |  |  | 0.30% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  |  |  |  | 0.00% |  |  |
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  | 4.30 | $ 4.30 |  |  |
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  | $ 3.57 | $ 3.57 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 20,833 | $ 20,833 |  |  |
Stock Option Plan 2011 [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 2,000,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) |  |  |  | 4,000,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercise Period from Grant Date (Year) |  |  |  | 3 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expire Period after Grant Date (Year) |  |  |  | 5 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 2,471,659 | 2,471,659 |  | 424,425 |
The 2020 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) |  |  |  |  |  | 4,000,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  | 5 years |  |  |
Chief Executive Officer, Chief Financial Officer and Employees [Member] |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares) |  | 2,370,345 |  |  | 2,264,127 | 2,264,127 | 2,370,345 |  |
Non-Employees [Member] |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 149,285 |  |  | 144,024 | 144,024 | 149,285 |  |
Vice Chairman of the Board of Directors [Member] | The 2020 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 5 years |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 2,000,000 |  |  |  |  |  |  |  |
Warrants Associated With April 2020 Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 2,710,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 1.20 |  |  |  |  |  |
Warrants Associated With the June 2020 Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 3,749,000 |  |  |  |  | 3,749,000 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 2.60 |  |  |  |  | $ 2.60 |  |
April 6, 2020 Public Offering [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  | $ 5,100,000 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 5,420,000 |  |  |  |  |  |
Share Price (in dollars per share) |  |  | $ 0.95 |  |  |  |  |  |
June 30, 2020 Public Offering [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  | $ 14,600,000 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 6,770,000 |  |  |  |  |  |  |
Share Price (in dollars per share) |  | $ 2.15 |  |  |  |  | $ 2.15 |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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