Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Schedule of Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Table Text Block]

	March 31,		December 31,
	2020		2019
Cash and cash equivalents	$	5,708	$	6,937
Restricted cash included in Other assets		475		475
Total cash, cash equivalents, and restricted cash in the statements of cash flows	$	6,183	$	7,412

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Three Months Ended March 31,
Major distribution or collaboration partner	2020			2019
Avenova Direct via Amazon		41	%		—	%
Distributor A		*	%		26	%
Distributor B		*	%		17	%
Distributor C		*	%		14	%

	March 31,			December 31,
Major distribution or collaboration partner	2020			2019
Avenova Direct via Amazon		12	%		20	%
Distributor A		24	%		28	%
Distributor B		10	%		13	%
Distributor C		19	%		19	%

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended March 31,
Numerator	2020			2019
Net loss	$	(1,582	)	$	(4,189	)
Denominator
Weighted average shares of common stock outstanding, basic and diluted		27,978			17,093
Net loss per share attributable to common stockholders, basic and diluted	$	(0.06	)	$	(0.25	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	As of March 31,
(in thousands)	2020		2019
Period end stock options to purchase common stock		2,099		2,389
Period end common stock warrants		8,247		544
		10,346		2,933