Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	December 31,		December 31,
	2019		2018
Cash and cash equivalents	$	6,937	$	3,183
Restricted cash included in Other assets		475		475
Total cash, cash equivalents, and restricted cash in the statements of cash flows	$	7,412	$	3,658

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

	Year Ended December 31,
Major distribution or collaboration partner	2019			2018			2017
Distributer A		16	%		23	%		22	%
Distributer B		17	%		26	%		23	%
Distributer C		15	%		25	%		21	%
Collaborator D		*	%		*	%		10	%
Avenova Direct via Amazon		15	%		—	%		—	%

	Year Ended December 31,
Major distribution or collaboration partner	2019			2018
Distributer A		28	%		32	%
Distributer B		13	%		31	%
Distributer C		19	%		23	%
Avenova Direct via Amazon		20	%		—	%

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

	Year Ended December 31,
Numerator	2019			2018			2017
Net loss	$	(9,658	)	$	(6,545	)	$	(7,403	)
Less: Preferred deemed dividend		800			—			—
Less: Retained earnings reduction related to warrants down round feature triggered		29			—			—
Net loss attributable to common stockholders, basic		(10,487	)		(6,545	)		(7,403	)
Less gain on changes in fair value of warrant liability		—			1,311			—
Net loss attributable to common stockholders, diluted	$	(10,487	)	$	(7,856	)	$	(7,403	)
Denominator
Weighted average shares outstanding, basic		21,641			16,921			15,324
Net loss per share, basic	$	(0.48	)	$	(0.39	)	$	(0.48	)
Weighted average shares outstanding, basic		21,641			16,921			15,324
Effect of dilutive warrants		—			137			—
Weighted average shares outstanding, diluted		21,641			17,058			15,324
Net loss per share, diluted	$	(0.48	)	$	(0.46	)	$	(0.48	)

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

	Year Ended December 31,
	2019		2018		2017
	(in thousands)
Stock options		2,183		3,374		2,960
Stock warrants		8,588		—		544
		10,771		3,374		3,504

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

Prepaid expenses and other current assets (a)	$	(49	)
Operating lease right-of-use assets		2,239
Other assets (b)		(2	)
Other accrued liabilities (c)		(101	)
Operating lease liability		1,063
Deferred rent		(184	)
Operating lease liability - non-current		1,410