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Note 3 - Liquidity and Going Concern (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 01, 2020
Jan. 03, 2020
Mar. 31, 2020
Mar. 31, 2019
Jun. 26, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sale of Stock, Number of Shares Issued in Transaction     $ 3,626,600          
Net Income (Loss) Attributable to Parent, Total     (638,696) $ (2,494,088)   $ (7,100,000) $ (3,600,000) $ (1,600,000)
Claims For Non Payment Of Contractual Obligations [Member]                
Aggregate Claims Made or Threatened     $ 500,000          
Purchase Agreement [Member] | Subsequent Event [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            
Purchase Agreement [Member] | Series A Preferred Stock [Member] | Subsequent Event [Member]                
Debt Conversion, Original Debt, Amount $ 478,017              
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            
Purchase Agreement [Member] | Series A Preferred Stock [Member] | Other Investors [Member] | Subsequent Event [Member]                
Sale of Stock, Number of Shares Issued in Transaction $ 1,000,000