Note 7 - Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

	Three Months Ended March 31,
	2021			2020
Dividend yield		0	%		0	%
Expected life (years)		4.9			4.9
Expected volatility		83	%		60	%
Risk-free interest rate		0.4	%		1.1	%

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

	Three Months Ended March 31,
	2021		2020
Cost of revenue — Edge to Cloud	$	15	$	4
Selling, general and administrative		146		206
Research and development		7		5
Total stock-based compensation expense	$	168	$	215

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, 2020		1,786,891		$	2.04		7.75	$	330,831
Granted		75,000			3.17
Exercised		(6,963	)		5.15
Forfeited		(32,450	)		1.02
Expired		(10,250	)		2.91
Balance at March 31, 2021		1,812,228			2.09		7.73		2,789,370
Vested and expected to vest at March 31, 2021		1,637,437			2.14		7.63		2,468,576
Exercisable at March 31, 2021		800,338			2.76		6.60		909,183

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

	Three Months Ended March 31,
	2021		2020
Weighted average grant-date fair value of options granted during the period	$	3.17	$	1.02
Options in-the-money (in shares)		550,733		—
Aggregate intrinsic value of options exercised during the period	$	5.15	$	—

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

	Number of			Weighted Average
	Shares			Award Price
Unvested at December 31, 2020		164,697		$	1.48
Granted		—			—
Vested		(54,899	)		1.48
Forfeited		—			—
Unvested at March 31, 2021		109,798			1.48
Expected to vest after March 31, 2021		107,223			1.48

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

	March 31, 2021
Stock options outstanding		1,812,228
Restricted stock units and performance stock units outstanding		609,798
Stock options and restricted stock units available for future grant		1,209,825
Common stock reserved for future issuance		3,631,851