Note 7 - Stockholders' Equity, Stock Options and Warrants (Details Textual)				1 Months Ended		3 Months Ended		4 Months Ended
	May 08, 2020 $ / shares shares	Apr. 04, 2020 shares	Oct. 24, 2019 USD ($) shares	Mar. 18, 2020 USD ($) $ / shares shares	Apr. 30, 2019 shares	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) shares
Share-based Payment Arrangement, Expense | $						$ 287,838	$ 263,600
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $						$ 110,628
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)						1 year 180 days
Equity Incentive Plan [Member] | Maximum [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)						10 years
Equity Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)						3 years
Warrants issued with Private Placement, One [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)				1
Warrants and Rights Outstanding, Term (Year)				5 years 182 days
Warrants issued with Private Placement, Two [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)				1
Warrants and Rights Outstanding, Term (Year)				2 years
Warrants issued with Private Placement [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 1.88
Prefunded Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 0.0001
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				1,390,166
Price of Warrant (in dollars per share) | $ / shares				$ 2.12
Equity Line Purchase Agreement [Member]
Issuance or Sale of Equity, Can Be Raised | $			$ 15,000,000
Stock Issued During Period, Shares, New Issues (in shares)			104,651			943,000
Stock Issued During Period, Value, New Issues | $			$ 450,000			$ 1,869,899
Sale of Stock, Remaining Available Balance | $						$ 12,810,907
Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares)				260,000
Stock Issued During Period, Value, New Issues | $							$ 2,429,709
Sale of Stock, Price Per Share (in dollars per share) | $ / shares				$ 2.12
Proceeds from Issuance or Sale of Equity, Total | $				$ 3,498,612
Proceeds from Issuance or Sale of Equity, Net of Stock Issuance Costs | $				$ 3,127,818
Subsequent Event [Member] | Warrants issued with Private Placement [Member]
Warrants and Rights Outstanding, Term (Year)	5 years 182 days
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 1.45
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	1,396,826
Subsequent Event [Member] | Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,396,826
Conversion from Series D Preferred Stock to Common Stock [Member] | Subsequent Event [Member]
Conversion of Stock, Shares Converted (in shares)		3,500,000
Conversion of Stock, Shares Issued (in shares)		350,004
Conversion of Series E Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)						50
Conversion of Stock, Shares Issued (in shares)						141,191
Series D Preferred Stock [Member]
Preferred Stock, Shares Issued, Total (in shares)					3,500,000
Convertible Preferred Stock, Conversion Rate					10
Series E Convertible Preferred Stock [Member]
Convertible Preferred Stock, Conversion Rate								0.00056857
Stock Issued During Period, Shares, Convertible Preferred Shares Issued (in shares)								258
Preferred Stock, Beneficial Conversion Feature | $								$ 289,935