Note 7 - Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2020			2019			2020			2019
Dividend yield		0	%		0	%		0	%		0	%
Expected life (years)		4.9			5.6			4.9			5.8
Expected volatility		63	%		64	%		63	%		64	%
Risk-free interest rate		0.2	%		1.6	%		0.5	%		2.1	%

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 revenue — Edge to Cloud	$	26	$	1	$	50	$	10
Selling, general and administrative		250		175		536		373
Research and development		5		12		15		(12	)
Total stock-based compensation expense	$	281	$	188	$	601	$	371

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

						Weighted
						Average
				Weighted		Remaining
				Average		Contractual		Aggregate
	Number of			Exercise		Life		Intrinsic
	Shares			Price		(in years)		Value
Balance at December 31, 2019		1,544,826		$	2.74		7.47	$	46,582
Granted		574,900			1.03
Exercised		(25,000	)		1.35
Forfeited		(109,656	)		1.72
Expired		(200,367	)		4.82
Balance at September 30, 2020		1,784,703			2.07		8.03		214,529
Vested and expected to vest at September 30, 2020		1,548,348			2.14		7.90		172,230
Exercisable at September 30, 2020		568,073		$	3.35		6.28	$	6,601

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Weighted average grant-date fair value of options granted during the period	$	1.37	$	1.23	$	1.03	$	1.70
Options in-the-money (in shares)		59,201		—		59,201		—
Aggregate intrinsic value of options exercised during the period	$	1.35	$	—	$	1.35	$	—

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		219,596			1
Vested		(112,846	)		1.44
Forfeited		—			—
Unvested at September 30, 2020		219,596		$	1.48
Expected to vest after September 30, 2020		206,673		$	1.48

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

	September 30, 2020
Stock options outstanding		1,784,703
Restricted stock units outstanding		219,596
Stock options and restricted stock units available for future grant		1,245,563
Common stock reserved for future issuance		3,249,862