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Note 8 - Stockholders' Equity - Summary of Shares to be Issued (Details) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Shares-to-be-issued, outstanding (in shares) 23,757,603 2,470,565
Granted in current period (in shares) 102,768 337,145
Issued in current period (in shares) (11,995)
Shares-to-be-issued, outstanding (in shares) 24,665,339 2,807,710