Note 6 - Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Other Current Liabilities [Table Text Block]

	December 31,
	2018		2017
Accrued interest payable	$	—	$	37,415
Accrued Series A convertible preferred stock dividends		—		1,062,314
Accrued payroll and payroll related expenses		409,889		312,221
Accrued professional fees		69,231		122,711
Accrued clinical studies expenses		34,000		63,350
Other		92,106		30,840
Total	$	605,226	$	1,628,851