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Note 17 - Stockholders' Equity (Details Textual) - USD ($)									1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 23, 2020	Jun. 08, 2020	May 14, 2020	May 12, 2020	Apr. 02, 2020	Mar. 30, 2020	Feb. 14, 2020	Sep. 23, 2015	Jul. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Mar. 12, 2020	Dec. 31, 2019	Aug. 24, 2018	Nov. 11, 2015	Nov. 13, 2014
Preferred Stock, Shares Authorized (in shares)										5,000,000		5,000,000
Preferred 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)						$ 1.50	$ 0.65											$ 3.60
Dividends, Paid-in-kind, Total							$ 41,688					$ 112,686
Stock Issued During Period, Shares, Warrants Exercises (in shares)						972,000
Proceeds from Warrant Exercises						$ 1,458,000						5,594,795
Proceeds from Issuance or Sale of Equity, Total	$ 22,700,000								$ 22,700,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)										306,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value										$ 80,093
Share-based Payment Arrangement, Expense										$ 54,230	$ 137,101	$ 709,788	$ 794,189
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)										$ 0.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)										197,500
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)										3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value										$ 198,900
Share-based Payment Arrangement, Expense										$ 3,427
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)										3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)										7 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate										0.28%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)										4 years 193 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										83.00%
Director [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)		1,581	1,632	7,077	6,850					10,328
Stock Issued During Period, Value, Issued for Services		$ 1,502	$ 1,501	$ 7,003	$ 5,001					$ 7,003
A New Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value					$ 2,267
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)					5,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.73
A New Employee [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)					3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)					7 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate					0.36%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)					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					83.00%
Convertible Note Due in July 13, 2020 [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)							$ 1.15
September 2015 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							384,618	69,445									166,668
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 3.60									$ 1.50
Referral Fee Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										25,000		25,000		125,000
Warrants and Rights Outstanding										$ 12,921		$ 12,921		$ 94,655
Pre-Funded Warrants [Member]
Class of Warrant or Right, Exercised During Period (in shares)	4,100,000
Equity Warrants [Member]
Class of Warrant or Right, Exercised During Period (in shares)	2,264,300
Promissory Note [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								69,445
Amended Note [Member] \| Senior Secured Convertible Note [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)							$ 0.65								$ 0.65
Private Investor SPA [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																			996,877
Public Offering [Member]
Proceeds from Issuance or Sale of Equity, Total	$ 22,700,000
Stock Issued During Period, Shares, New Issues (in shares)	34,114,500
Stock Issued During Period, Shares, Conversion of Warrant (in shares)	6,364,300
Series A-1 Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)										100,000		100,000
Series B-1 Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)										105,000		105,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)										0		0				0
September 2015 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 3.60
Term Of Warrant (Year)								5 years