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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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Maximum percentage of securities into which the class of warrant or right may be converted.

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Exercise price per share or per unit of warrants or rights outstanding.

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The price per share of the conversion feature embedded in the debt instrument.

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