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Note 9 - Stockholders' Equity - Summary of Shares to be Issued (Details) - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Shares-to-be-issued, outstanding (in shares) 2,428,329 2,375,762
Granted in current period (in shares) 33,238 363,956
Issued in current period (in shares) (455,906) (387,991)
Shares-to be issued outstanding (in shares) 2,005,661 2,351,727