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Note 14 - Subsequent Events (Details Textual) - USD ($)
 1 Months Ended
Nov. 17, 2020
Oct. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Proceeds from Issuance or Sale of Equity, Total     $ 1,500,000  
Advance from Investor, Current     $ 1,500,000
Subsequent Event [Member]        
Proceeds from Issuance or Sale of Equity, Total   $ 1,500,000    
Proceeds from Advances on Proposed Equity Financing   $ 1,500,000    
Subsequent Event [Member] | Series B Preferred Stock [Member]        
Stock Issued During Period, Shares, New Issues (in shares) 170,000      
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) 10      
Preferred Stock, Dividend Rate, Percentage 8.00%      
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) $ 10