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Note 10 - Stockholders' Equity (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 22, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Common Stock, Shares Authorized |  | 25,000,000 | 25,000,000
Common Stock, Par or Stated Value Per Share |  | $ 0.001 | $ 0.001
Common Stock, Shares, Issued, Total |  | 20,547,668 | 18,228,887
Preferred Stock, Shares Authorized |  | 2,500,000 | 2,500,000
Preferred Stock, Shares Issued, Total |  | 0 | 0
Proceeds from Issuance of Common Stock |  | $ 14,650,039 | $ 6,029,677
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance |  | 25,000 | 70,000
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  | $ 0 |
Common Stock, Shares, Outstanding, Ending Balance |  | 20,547,668 | 18,228,887
Preferred Stock, Shares Outstanding, Ending Balance |  | 0 | 0
The 2011 Stock Options Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance |  | 25,000 |
Stock Awards Other than Options [Member] |  |  |
Share-based Payment Arrangement, Expense |  | $ 85,443 | $ 100,667
Share-based Payment Arrangement, Option [Member] | The 2011 Stock Options Plan [Member] |  |  |
Share-based Payment Arrangement, Expense |  | $ 0 | $ 15,767
Public Offering [Member] |  |  |
Stock Issued During Period, Shares, New Issues | 2,215,862 |  |
Share Price | $ 7.25 |  |
Proceeds from Issuance of Common Stock | $ 14,516,839 |  |
Payments of Stock Issuance Costs | $ 1,548,161 |  |
Convertible Preferred Stock [Member] |  |  |
Preferred Stock, Shares Issued, Total |  | 0 | 0
Preferred Stock, Shares Outstanding, Ending Balance |  | 0 | 0

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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