Note 7 - Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Cost of revenues	$	3,000	$	1,000	$	5,000	$	2,000
Sales and marketing		65,000		110,000		106,000		166,000
Research and development		36,000		38,000		72,000		75,000
General and administrative		130,000		104,000		432,000		216,000
Total	$	234,000	$	253,000	$	615,000	$	459,000

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		615,500		$	5.92
Forfeited		(15,158	)	$	5.13
Outstanding at September 30, 2020		892,149		$	8.57		8.997	$	--
Vested and expected to vest at September 30, 2020		565,836		$	9.91		8.736	$	--
Exercisable at September 30, 2020		184,137		$	17.05		7.665	$	--

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 September 30, 2020		1,116,484		$	37.27
Exercisable at September 30, 2020		1,046,631		$	34.42