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Note 13 - Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 14, 2019 | Mar. 28, 2019 | Aug. 24, 2018 | Nov. 11, 2015 | Oct. 29, 2015 | Sep. 23, 2015 | Nov. 13, 2014 | May 31, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Oct. 31, 2017 | Sep. 30, 2017 | May 23, 2018 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | May 31, 2018 | Dec. 31, 2015
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  | 5,000,000 |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  | $ 0.0001 |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,505 | $ 16,506 | $ 6,509 | $ 16,513 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 3.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  | 69,445 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Purchase Agreement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 2,392,502 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ 1,288,139 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 166,668 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ 140,827 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Investor SPA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  | 664,584 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 996,877 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  |  |  |  | $ 1,595,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Of Warrant |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  | $ 3.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total | 4,235 | 13,820 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $ 5,505 | $ 16,506 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certain Officers, Employees, and Contractors [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 235,334 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.18 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 243,643 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.35% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years 182 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 143.00% |  |  |
Conversion of Series A-1 Shares into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |
Conversion of Dividends Payable on Series A-1 Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 248,893 |
Conversion of Dividends Payable, Amount Converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 356,015 | $ 896,015 |
Conversion of Series B-1 Shares into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  | 2,916,668 |  |  |  |  |  |  |  |
Conversion of Dividends Payable on Series B-1 Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  | 131,229 |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Amount Converted |  |  |  |  |  |  |  |  |  |  |  |  | $ 472,426 |  |  |  |  |  | $ 472,426 |  |
Series A-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  | 100,000 |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 5,500 | 84,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |
Share Price |  |  |  | $ 100 | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  | $ 550,000 | $ 8,450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Amount Converted |  |  |  |  |  |  |  | $ 25,463 | $ 330,552 |  |  | $ 540,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |
Series B-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,000 |  |  |  | 105,000 |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 105,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,000
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |
Share Price |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  | $ 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Amount Converted |  |  |  |  |  |  |  | $ 55,342 |  | $ 417,084 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |
September 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Of Warrant |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  | $ 3.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The estimated measure of the 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 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)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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