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Note 17 - Subsequent Events (Details Textual) - USD ($) |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2019 | Jul. 10, 2019 | Jul. 01, 2019 | Jun. 14, 2019 | May 14, 2019 | Apr. 04, 2019 | Mar. 28, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Nov. 11, 2015
Stock Issued During Period, Shares, Commitment Fees |  |  |  | 200,000 |  | 80,000 |  | 300,000 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  |  |  | $ 3.60
Payments of Stock Issuance Costs |  |  |  |  |  |  |  |  | $ 17,000 | $ 15,212 |
Convertible Debentures [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  |  |  | $ 1.50 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  | $ 50,000 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Due Diligence Fee |  | 266,667 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Due Diligence Fee |  | $ 400,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Investor Warrant [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term |  | 5 years |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 2,000,000 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 1.50 |  |  |  |  |  |  |  |  |
Class of Warrant or Rights, Maximum Percentage of Securities Called by Warrants or Rights |  | 20.00% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | 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, Periodic Payment, Principal due in 180 Days |  | 918,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal due in 270 Days |  | $ 1,071,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Default Rate Percentage |  | 18.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal, Maximum Percent |  | 20.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  | $ 1.50 |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Percent |  | 25.00% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Convertible Debentures [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Commitment Fees |  |  | 10,000 |  |  |  |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total |  |  |  |  | 4,235 |  | 13,820 |  |  |  |
Director [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total | 4,425 |  |  |  |  |  |  |  |  |  |

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