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Note 16 - Earnings Per Share ("EPS") - Common Stock ("EPS") - Reconciliation of Numerator of Basic and Diluted EPS Calculations (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 23, 2015
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Net loss   $ (1,161,683) $ (851,431) $ (1,572,709) $ (3,370,282) $ (2,013,114) $ (4,942,991)
Deemed dividends related to down-round features $ (41,688) 0   0   0 (112,686)
Net loss available to common stockholders   $ (1,161,683)   $ (1,572,709)   $ (2,013,114) $ (5,055,677)