Note 7 - Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Dividend yield		0	%		0	%		0	%		0	%
Expected life (years)		4.9			5.8			4.9			5.9
Expected volatility		63	%		64	%		63	%		64	%
Risk-free interest rate		0.3	%		2.2	%		0.7	%		2.2	%

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 revenue — Edge to Cloud	$	20	$	3	$	24	$	9
Selling, general and administrative		80		10		286		198
Research and development		5		2		10		(24	)
Total stock-based compensation expense	$	105	$	15	$	320	$	183

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

						Weighted
						Average
						Remaining
				Weighted		Contractual
	Number of			Average		Life		Aggregate
	Shares			Exercise Price		(in years)		Intrinsic Value
Balance at December 31, 2019		1,544,826		$	2.74		7.47	$	46,582
Granted		567,900			1.02
Exercised		—			—
Forfeited		(109,656	)		1.72
Expired		(172,898	)		4.82
Balance at June 30, 2020		1,830,172			2.07		8.15		418,539
Vested and expected to vest at June 30, 2020		1,540,412			2.20		7.94		320,836
Exercisable at June 30, 2020		529,497		$	3.63		5.51	$	6,100

Schedule of Share Based Compensation Additional Stock Options Activity [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Weighted average grant-date fair value of options granted during the period	$	1.66	$	1.35	$	1.02	$	1.88
Options in-the-money (in shares)		25,344		—		25,344		—
Aggregate intrinsic value of options exercised during the period	$	—	$	—	$	—	$	—

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	Number of			Weighted Average
	Shares			Award Price
Unvested at December 31, 2019		112,846		$	1.44
Granted		—			—
Vested		(112,846	)		1.44
Forfeited		—			—
Unvested at June 30, 2020		—		$	—
Expected to vest after June 30, 2020		—		$	—

Schedule of Common Stock Reserved For Future Issuance [Table Text Block]

	June 30, 2020
Stock options outstanding		1,830,172
Restricted stock units outstanding		—
Stock options and restricted stock units available for future grant		1,444,690
Common stock reserved for future issuance		3,274,862