Note 6 - Other Accrued Expenses and Liabilities - Summary of Accrued Expenses (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Accrued interest payable	$ 36,029	$ 29,359
Accrued Series A dividends	725,774
Accrued payroll and payroll related expenses	398,859	399,740
Accrued professional fees	114,268	72,855
Accrued clinical studies expenses	88,175	220,978
Other accrued expenses	52,602	151,332
Total	$ 1,415,707	$ 874,264