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Note 4 - Other Accrued Expenses and Liabilities - Summary of Accrued Expenses (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Accrued interest payable $ 38,771 $ 37,415
Accrued Series A dividends 1,062,314
Accrued payroll and payroll related expenses 184,689 312,221
Accrued professional fees 85,235 122,711
Accrued clinical studies expenses 55,210 63,350
Other accrued expenses 89,808 30,840
Total $ 453,713 $ 1,628,851