Note 7 - Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

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,
	2021			2020			2021			2020
Dividend yield		0	%		0	%		0	%		0	%
Expected life (years)		4.9			4.9			4.9			4.9
Expected volatility		111	%		63	%		111	%		63	%
Risk-free interest rate		0.6	%		0.2	%		0.6	%		0.5	%

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Cost of revenue — Edge to Cloud	$	6	$	26	$	30	$	50
Selling, general and administrative		188		250		515		536
Research and development		24		5		51		15
Total stock-based compensation expense	$	218	$	281	$	596	$	601

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		175,000			2.88
Exercised		(36,130	)		1.88
Forfeited		(74,759	)		1.34
Expired		(62,750	)		2.62
Balance at September 30, 2021		1,788,252			1.92		7.15		1,220,636
Vested and expected to vest at September 30, 2021		1,670,375			2.17		7.06		1,122,212
Exercisable at September 30, 2021		934,877		$	2.58		6.10	$	496,868

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Weighted average grant-date fair value of options granted during the period	$	2.75	$	1.37	$	2.88	$	1.03
Options in-the-money (in shares)		629,272		59,201		629,272		59,201
Aggregate intrinsic value of options exercised during the period	$	1.20	$	1.35	$	1.88	$	1.35

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		90,343			2.72
Vested		(182,004	)		1.74
Forfeited		(21,115	)		1.48
Unvested at September 30, 2021		51,921			2.72
Expected to vest after September 30, 2021		49,112		$	2.72

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

	September 30, 2021
Stock options outstanding		1,788,252
Restricted stock units and performance stock units outstanding		551,921
Stock options and restricted stock units available for future grant		1,115,772
Common stock reserved for future issuance		3,455,945