Note 3 - Liquidity and Going Concern (Details Textual) - USD ($)				3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 01, 2020	Apr. 01, 2020	Jan. 03, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 26, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 17, 2020
Sale of Stock, Number of Shares Issued in Transaction				$ 1,800,001		$ 303,000	$ 5,426,601		$ 303,000
Net Income (Loss) Attributable to Parent, Total				$ (1,527,509)		$ (1,244,478)	(2,166,205)		$ (3,738,565)	$ (7,100,000)	$ (3,600,000)	$ (1,600,000)
Claims For Non Payment Of Contractual Obligations [Member]
Aggregate Claims Made or Threatened							500,000
Conversion to an Accounts Receivable [Member]
Debt Conversion, Original Debt, Amount							478,000
Series A Preferred Stock [Member] | Conversion to an Accounts Receivable [Member]
Debt Conversion, Original Debt, Amount		$ 482,000
Accounts Receivable, Shares Converted to Preferred Stock (in shares)		48,200
Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)								400,000
Purchase Agreement [Member] | Series A Preferred Stock [Member]
Sale of Stock, Shares Agreed to Purchase (in shares)			500,000
Shares Issued, Price Per Share (in dollars per share)			$ 10
Sale of Stock, Offering Amount			$ 5,000,000
Accounts Receivable, Shares Converted to Preferred Stock (in shares)	48,200
Purchase Agreement [Member] | Series A Preferred Stock [Member] | Other Investors [Member]
Sale of Stock, Additional Authorized Shares			$ 2,000,000
Sale of Stock, Number of Shares Issued in Transaction							$ 1,000,000
PNC Agreements [Member]
Debt Instrument Covenants Fixed Charge Coverage Ratio (Rate)					75.00%
PNC Agreements [Member] | Subsequent Event [Member] | PNC [Member]
Minimum Commitmnet for Equity Funding													$ 3,000,000