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Note 7 - Stockholders' Equity (Details Textual) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 06, 2020 | May 21, 2020 | Jan. 15, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2013 | Jun. 30, 2020 | Dec. 31, 2019
Common Stock, Shares Authorized (in shares) |  |  |  | 25,000,000 |  |  |  | 25,000,000 |  |  | 25,000,000 | 25,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 |  | $ 0.001 |  |  |  | $ 0.001 |  |  | $ 0.001 | $ 0.001
Common Stock, Shares, Issued, Total (in shares) |  |  |  | 21,649,213 |  | 20,547,668 |  | 21,649,213 | 20,547,668 |  | 21,649,213 | 20,547,668
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  | 21,649,213 |  | 20,547,668 |  | 21,649,213 | 20,547,668 |  | 21,649,213 | 20,547,668
Preferred Stock, Shares Authorized (in shares) |  |  |  | 2,500,000 |  |  |  | 2,500,000 |  |  | 2,500,000 | 2,500,000
Preferred Stock, Shares Issued, Total (in shares) |  |  |  | 0 |  |  |  | 0 |  |  | 0 | 0
Stock Issued During Period, Value, Issued for Services |  |  |  |  | $ 45,000 |  | $ 112,500 |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 1,085,000 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 5.00 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 4,744,048 |  |  |  |  |  | $ 4,744,048 | $ 14,674,738 |  |  |
Payments of Stock Issuance Costs |  | $ 680,952 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 515,000 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 5.00 |  | $ 5.00 |  |  |  | $ 5.00 |  |  | $ 5.00 |
Proceeds from Issuance of Warrants |  | $ 2,575,000 |  |  |  |  |  | $ 2,575,000 | 0 |  |  |
Share-based Payment Arrangement, Expense |  |  |  | $ 82,335 |  | $ 23,167 |  | $ 223,557 | 151,611 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  | 25,000 |  |  |  | 25,000 |  |  | 25,000 | 25,000
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  | $ 0 |  |  |  | $ 0 |  |  | $ 0 |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  | 0 |  |  |  | 0 |  |  | 0 | 0
The 2011 Stock Options Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  | 25,000 |  |  |  | 25,000 |  |  | 25,000 |
The Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 515,000 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 5.00 |  |  |  |  |  |  |  |  |  |
Stock Awards Other than Options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  | $ 223,557 | 151,611 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  | $ 82,335 |  | $ 23,167 |  | $ 223,557 | $ 151,611 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  |  | 136,632 |  |  |  | 136,632 |  |  | 136,632 | 133,747
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  | 19,430 |  | 25,000 | 92,081 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  |  | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Annual Grant |  |  |  |  |  |  |  | $ 30,000 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  | $ 559,167 |  |  |  | 559,167 |  |  | $ 559,167 |
Share-based Payment Arrangement, Option [Member] | The 2011 Stock Options Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  | $ 0 |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) | 8,333 |  | 8,212 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services | $ 69,333 |  | $ 45,000 |  |  |  |  |  |  |  |  |
Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  |  | 0 |  | 0 |  | 0 | 0 |  | 0 |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  | 0 |  | 0 |  | 0 | 0 |  | 0 |

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