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Note 1 - Summary of Significant Accounting Policies - Fair Value Measurement of Warrant Liability (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Base value of warrants, 515,000 warrants at $5 $ 2,575,000        
Fair value adjustment 236,900 $ 236,900 $ (0) $ 236,900 $ (0)
Balance at June 30, 2020 $ 2,811,900 $ 2,811,900   $ 2,811,900