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Note 10 - Subsequent Events (Details Textual) - USD ($)
1 Months Ended
Jul. 15, 2019
Jun. 13, 2019
May 30, 2019
May 21, 2019
May 09, 2019
Aug. 13, 2019
Jul. 31, 2019
Private Placement [Member] | Series E Convertible Preferred Stock [Member]              
Proceeds from Issuance or Sale of Equity, Net of Stock Issuance Costs   $ 776,000          
Chief Executive Officer [Member]              
Proceeds from Related Party Debt       $ 1,620,000      
Subsequent Event [Member] | Skyline Lay-offs [Member]              
Severance Costs             $ 300,673
Subsequent Event [Member] | Skyline Lay-offs [Member] | One Individual [Member]              
Severance Costs             $ 247,500
Subsequent Event [Member] | Private Placement [Member] | Series E Convertible Preferred Stock [Member]              
Proceeds from Issuance or Sale of Equity, Net of Stock Issuance Costs           $ 1,238,800  
Expected Gross Proceeds from Issuance of Equity           $ 3,500,000  
Loans From Dr. Schwartz [Member] | Chief Executive Officer [Member]              
Proceeds from Related Party Debt     $ 200,000   $ 75,000    
Debt Instrument, Interest Rate, Stated Percentage     8.00%        
Loans From Dr. Schwartz [Member] | Subsequent Event [Member] | Chief Executive Officer [Member]              
Proceeds from Related Party Debt $ 25,000            
Debt Instrument, Interest Rate, Stated Percentage 8.00%