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Note 1 - Summary of Significant Accounting Policies - Recurring Fair Value Measurements (Details) - USD ($)
Jun. 30, 2020
May 21, 2020
Prefunded warrants $ 2,811,900 $ 2,575,000
Fair Value, Recurring [Member]    
Contingent Earn-out Liability 901,537  
Prefunded warrants 2,811,900  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Contingent Earn-out Liability 0  
Prefunded warrants 2,811,900  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Contingent Earn-out Liability 0  
Prefunded warrants 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Contingent Earn-out Liability 901,537  
Prefunded warrants $ 0