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Note 11 - Convertible Notes Payable (Details Textual) - USD ($) |  |  |  |  |  | 2 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 12, 2020 | Feb. 13, 2020 | Jan. 13, 2020 | Jul. 10, 2019 | Jun. 08, 2020 | Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | May 06, 2020 | Feb. 14, 2020 | Dec. 31, 2019 | Nov. 11, 2015
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.65 |  | $ 3.60
Payments of Stock Issuance Costs, Commitment Fees |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Due Diligence Fee (in shares) |  |  |  |  | 266,667 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Due Diligence Fee |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs, Banker Fees |  |  |  |  | 193,500 |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs, Legal Fees |  |  |  |  | 71,330 |  |  |  |  |  |  |  |
Class of Warrant or Right, Recorded as Debt Discount |  |  |  |  | $ 595,662 |  |  |  |  |  |  |  |
Share Price (in dollars per share) |  | $ 0.76 |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |
Notes Payable, Current, Total | $ 2,301,956 |  |  |  |  |  | $ 2,301,956 | $ 2,301,956 |  |  |  | $ 2,255,454 |
Conversion of Senior Secured Convertible Note to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 2,307,690 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Senior Secured Convertible Note to Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  |  |  | 5,384,610 |  |  |  |  |  |  |
Investor Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 1.50 |  |  |  |  |  |  |  |
Class of Warrant or Rights, Maximum Percentage of Securities Called by Warrants or Rights |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Senior Secured Convertible Note [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 2,415,000 |  |  |
Share Price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.16 |  |  |
Debt Instrument, Fee Amount |  |  |  |  |  |  |  |  |  | $ 133,333 |  |  |
The Note [Member] | Senior Secured Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 3,060,000 |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs |  |  |  |  | 2,550,000 |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount, Total |  |  |  |  | 510,000 |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal due in 180 Days |  |  |  |  | 918,000 |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal due in 270 Days |  |  |  |  | $ 1,071,000 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  | $ 1.50 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Percent |  |  |  |  | 25.00% |  |  |  |  |  |  |  |
Amended Note [Member] | Senior Secured Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 3,789,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount, Total |  | $ 641,215 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  | $ 0.65 |  |  |  |  |  |  |  |  | $ 0.65 |  |
Interest Expense, Debt, Total |  | $ 729,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Beneficial Conversion Feature, Per Share (in dollars per share) |  | $ 0.11 |  |  |  |  |  |  |  |  |  |  |
Amended Note [Member] | Senior Secured Convertible Note [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Current, Total |  |  |  |  |  | $ 289,000 |  |  |  |  |  |  |
January 2020 Note [Member] | Secured Redeemable Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 157,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  | $ 1.50 |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Commitment Fees (in shares) |  |  |  | 650,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  | $ 75,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Shares to be Paid, Commitment Fee, Repaid Prior to Maturity (in shares) |  |  |  | 50,000 |  |  |  |  |  |  |  |  |
Legal Fees |  |  |  | $ 7,000 |  |  |  |  |  |  |  |  |
January 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Premium Payment Percentage |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
January 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Premium Payment Percentage |  |  |  | 30.00% |  |  |  |  |  |  |  |  |
February 2020 Note [Member] | Secured Redeemable Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 126,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  | $ 0.65 | $ 1.15 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Commitment Fees (in shares) |  |  | 550,000 |  |  |  | 50,000 |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  | $ 57,500 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Shares to be Paid, Commitment Fee, Repaid Prior to Maturity (in shares) |  |  | 50,000 |  |  |  |  |  |  |  |  |  |
Legal Fees |  |  | $ 6,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Deemed Dividend Expense |  | $ 70,998 |  |  |  |  |  |  |  |  |  |  |
February 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Premium Payment Percentage |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
February 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Premium Payment Percentage |  |  | 30.00% |  |  |  |  |  |  |  |  |  |

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