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Note 8 - Convertible Notes (Details Textual)
1 Months Ended 6 Months Ended
Jul. 14, 2020
USD ($)
Jul. 30, 2020
Jun. 30, 2020
USD ($)
Debt Instrument, Debt Default, Amount     $ 9,675,000
Subsequent Event [Member]      
Debt Instrument, Convertible, Number of Equity Instruments   15,000  
Convertible Debt [Member]      
Debt Instrument, Convertible, Number of Equity Instruments     3,825,823
Convertible Debt [Member] | Subsequent Event [Member]      
Debt Instrument, Convertible, Number of Equity Instruments 2,147,088    
Debt Instrument, Debt Default, Amount $ 3,474,805