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Note 4 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Accrued interest payable $ 37,415
Accrued Series A dividends 1,062,314
Accrued payroll and payroll related expenses 618,131 312,221
Accrued professional fees 80,051 122,711
Accrued clinical studies expenses 47,688 63,350
Other accrued expenses 70,750 30,840
Total $ 816,620 $ 1,628,851