Note 7 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Cost of revenues	$	2,000	$	1,000	$	2,000	$	1,000
Sales and marketing		28,000		44,000		41,000		56,000
Research and development		21,000		22,000		36,000		37,000
General and administrative		263,000		58,000		302,000		112,000
	$	314,000	$	125,000	$	381,000	$	206,000

Share-based Payment Arrangement, Option, Activity [Table Text Block]

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life		Aggregate Intrinsic Value
Outstanding at December 31, 2019		291,807		$	13.96
Granted		605,500			5.94
Forfeited		(3,958	)	$	3.74
Outstanding at June 30, 2020		893,349		$	8.57		9.25	$	514,200
Vested and expected to vest at June 30, 2020		539,272		$	10.07		8.96	$	402,783
Exercisable at June 30, 2020		183,824		$	17.07		7.92	$	213,047

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	Number of Shares			Weighted-Average Exercise Price Per Share
Balance at December 31, 2019		1,716,066		$	25.23
Warrants expired		--			--
Warrants exercised		(599,582	)	$	2.81
Outstanding at June 30, 2020		1,116,484		$	37.27
Exercisable at June 30, 2020		1,046,631		$	34.42