Note 3 - Liquidity and Going Concern (Details Textual)			1 Months Ended		3 Months Ended						6 Months Ended	9 Months Ended		12 Months Ended
	Nov. 17, 2020 shares	Apr. 13, 2020 USD ($) $ / shares shares	Oct. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 22, 2020 USD ($)
Stock Issued During Period, Value, New Issues						$ 1,800,001	$ 3,626,600		$ 303,000
Proceeds from Issuance of Convertible Preferred Stock												$ 1,500,000
Proceeds from Issuance or Sale of Equity, Total				$ 1,500,000
Net Income (Loss) Attributable to Parent, Total					$ (953,940)			$ (1,941,586)				(3,120,145)	$ (5,680,151)	$ (7,100,000)	$ (3,600,000)	$ (1,600,000)
Claims For Non Payment Of Contractual Obligations [Member]
Loss Contingency, Damages Sought, Value												$ 500,000
Subsequent Event [Member]
Proceeds from Issuance or Sale of Equity, Total			$ 1,500,000
PNC Agreements [Member] | PNC [Member]
Minimum Commitmnet for Equity Funding																	$ 3,000,000
PNC Agreements [Member] | Minimum [Member]
Debt Instrument Covenants Fixed Charge Coverage Ratio							0.75
PNC Agreements [Member] | Maximum [Member]
Debt Instrument Covenants Fixed Charge Coverage Ratio							1
Series B Preferred Stock [Member]
Proceeds from Issuance of Convertible Preferred Stock				$ 1,500,000
Series B Preferred Stock [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	170,000
Purchase Agreement [Member]
Debt Conversion, Original Debt, Amount											$ 478,000
Stock Issued During Period, Shares, New Issues (in shares) | shares											400,000
Purchase Agreement [Member] | Series A Preferred Stock [Member]
Sale of Stock, Shares Agreed to Purchase (in shares) | shares		500,000
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 10
Proceeds from Issuance of Preferred Stock and Preference Stock		$ 5,000,000
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares											48,200
Purchase Agreement [Member] | Series A Preferred Stock [Member] | Other Investors [Member]
Sale Of Stock, Contingent, Additional Offered Shares, Amount		$ 2,000,000
Stock Issued During Period, Value, New Issues											$ 1,000,000