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Note 19 - Subsequent Events (Details Textual) - USD ($)					1 Months Ended		6 Months Ended
	Aug. 12, 2020	Jul. 31, 2020	Jul. 27, 2020	Jul. 20, 2020	Aug. 13, 2020	Jul. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Feb. 14, 2020	Dec. 31, 2019	Nov. 11, 2015
Common Stock, Par or Stated Value Per Share (in dollars per share)							$ 0.0001			$ 0.0001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 0.65		$ 3.60
Repayments of Convertible Debt							$ 211,984
Subsequent Event [Member]
Stock Issued During Period, Shares, Conversion of Warrant (in shares)	475,500	211,000
Stock Issued During Period, Shares, New Issues (in shares)				29,130,000
Common Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.0001
Commissions and Fees, Percent of Gross Proceeds				8.00%
Proceeds from Issuance or Sale of Equity, Total				$ 22,800,000		$ 22,800,000
Repayments of Convertible Debt				4,200,000
Common Stock Outstanding, Increase (Decrease) (in shares)					38,214,500
Convertible Notes Payable, Total				0
Subsequent Event [Member] | Maximum [Member]
Payments of Stock Issuance Costs				$ 80,000
Subsequent Event [Member] | Over-Allotment Option [Member]
Stock Issued During Period, Shares, New Issues (in shares)				4,984,500
Subsequent Event [Member] | Pre-Funded Warrants [Member]
Stock Issued During Period, Shares, Conversion of Warrant (in shares)			4,100,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				4,100,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 0.01
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)				1
Subsequent Event [Member] | Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				33,230,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 0.65
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)				1
Class of Warrant or Right, Issued During Period, Price Per Share (in dollars per share)				$ 0.65
Warrants and Rights Outstanding, Term (Year)				5 years
Subsequent Event [Member] | Warrants [Member]
Class of Warrant or Right, Issued During Period, Price Per Share (in dollars per share)				$ 0.64
Subsequent Event [Member] | Over Allotment Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)				4,984,500

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