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Note 7 - Other Accrued Liabilities - Other Accrued Liabilities (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Amounts due to contract research organizations and other contractual agreements $ 665,373 $ 1,115,193
Accrued payroll and related benefits 1,258,265 1,066,751
Accrued professional fees 264,668 259,550
Accrued interest on notes payable 22,241
Other 94,521 20,021
Total $ 2,282,827 $ 2,483,756