Note 7 - Stockholders' Equity, Stock Options and Warrants (Details Textual)								1 Months Ended				3 Months Ended				4 Months Ended	6 Months Ended
	Jun. 12, 2020 shares	May 27, 2020 USD ($) shares	May 08, 2020 USD ($) $ / shares shares	Apr. 21, 2020 USD ($) $ / shares shares	Apr. 04, 2020 shares	Mar. 18, 2020 $ / shares shares	Oct. 24, 2019 USD ($) shares	Jun. 30, 2020 USD ($) $ / shares shares	May 31, 2020 shares	Mar. 18, 2020 USD ($) $ / shares shares	Apr. 30, 2019 shares	Jun. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares shares
Stock Issued During Period, Value, New Issues | $													$ 130,000
Debt Instrument, Face Amount | $								$ 4,694,476				$ 4,694,476					$ 4,694,476			$ 5,146,226
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.01				$ 0.01					$ 0.01			$ 0.01
Share-based Payment Arrangement, Expense | $												$ 134,939		$ 1,380,620			$ 422,777	$ 1,644,220
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $														$ 59,210				$ 59,210
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)																	1 year 180 days
Other Capitalized Property Plant and Equipment [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total | $		$ 1,492,500
Asset Purchase Agreement with InventaBiotech and Its Subsidiaries, Soluble and BioDeth [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)		125,000
Asset Purchase Shares Issued Shares Escrow Deposit To Be Released Upon Six Months Anniversary Of Closing (in shares)		(25,000)
Asset Purchase Shares Issued, Shares Escrow Deposit To Be Released Upon Nine Months Anniversary Of Closing (in shares)		25,000
Business Acquisition, Right to Reclaim, Number of Shares (in shares)		10,000
Conversion of Promissory Note Into Common Stock [Member]
Shares Issued, Price Per Share (in dollars per share) | $ / shares				$ 1.43
DrSchwartz Notes [Member]
Debt Instrument, Face Amount | $				$ 2,115,000															$ 2,115,000	$ 2,115,000
DrSchwartz Notes [Member] | Conversion of Promissory Note Into Common Stock [Member]
Debt Conversion, Converted Instrument, Shares Issued (in shares)				1,533,481
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 [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			1,396,826			1,390,166				1,390,166
Price of Warrant (in dollars per share) | $ / shares						$ 2.12
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 1.45			$ 0.001				$ 0.001
Warrants and Rights Outstanding, Term (Year)			5 years 182 days
Shares Issued, Price Per Share (in dollars per share) | $ / shares			$ 1.575
Series A Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						1,650,166				1,650,166
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 1.88				$ 1.88
Warrants and Rights Outstanding, Term (Year)						5 years 182 days				5 years 182 days
Series B Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						1,650,166				1,650,166
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 1.88				$ 1.88
Warrants and Rights Outstanding, Term (Year)						2 years				2 years
Prefunded Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						1,390,166				1,390,166
Price of Warrant (in dollars per share) | $ / shares										$ 2.12
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 0.0001				$ 0.0001
Warrant Issued in Connection With May 2020 Offering [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares								$ 1.45				$ 1.45					$ 1.45
Class of Warrant or Right Issued During Period (in shares)								1,396,826
June 2020 Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares								$ 1.80				$ 1.80					$ 1.80
Warrants and Rights Outstanding, Term (Year)								5 years 182 days				5 years 182 days					5 years 182 days
Class Of Warrant Or Right, Purchase Price Per Warrant (in dollars per share) | $ / shares								$ 0.125				$ 0.125					$ 0.125
Class of Warrant or Right, Percentage of Shares Issued Pursuant to Exercise of Existing Warrant								100.00%				100.00%					100.00%
Proceeds from Issuance and Exercise of Warrants | $								$ 2,130,701
Proceeds from Issuance and Exercise of Warrants, Net | $								1,865,800
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				$ 12,810,907					$ 12,810,907
Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares)			1,396,826							260,000
Stock Issued During Period, Value, New Issues | $															$ 2,429,709
Sale of Stock, Price Per Share (in dollars per share) | $ / shares						$ 2.121				$ 2.121
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
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.01
Registered Direct Offering [Member]
Proceeds from Issuance or Sale of Equity, Total | $			$ 2,200,001
Proceeds from Issuance or Sale of Equity, Net of Stock Issuance Costs | $			$ 1,930,101
Conversion from Series D Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)					3,500,000
Conversion of Stock, Shares Issued (in shares)					350,004
Conversion from Series E Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)									207.7
Conversion of Stock, Shares Issued (in shares)	1,257,416
Conversion of Stock, Shares Issued, Percentage of Outstanding Shares	11.80%								0.05686%
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	207.7
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
Preferred Stock, Shares Outstanding, Ending Balance (in shares)								0				0					0			285