Note 6 - Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2022

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,
	2022			2021			2022			2021
Dividend yield		0	%		0	%		0	%		0	%
Expected life (years)		4.9			4.8			4.9			4.8
Expected volatility		111	%		105	%		111	%		105	%
Risk-free interest rate		2.9	%		0.6	%		2.3	%		0.5	%

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Cost of revenue — Edge to Cloud	$	4	$	9	$	10	$	24
Selling, general and administrative		34		181		100		327
Research and development		2		20		5		27
Total stock-based compensation expense	$	40	$	210	$	115	$	378

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, 2021		1,664,014		$	2.07		6.64	$	405,223
Granted		66,500			1.76
Exercised		(59,375	)		1.18
Forfeited		(62,479	)		1.80
Expired		(44,500	)		3.47
Balance at June 30, 2022		1,564,160			2.06		6.53		91,690
Vested and expected to vest at June 30, 2022		1,521,640			2.07		6.48		88,659
Exercisable at June 30, 2022		1,049,454			2.31		5.91		50,904

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Weighted average grant-date fair value of options granted during the period	$	1.51	$	2.64	$	1.76	$	2.89
Options in-the-money (in shares)		215,942		706,620		215,942		706,620
Aggregate intrinsic value of options exercised during the period	$	1.02	$	1.02	$	1.18	$	2.20

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

	Number of			Weighted Average
	Shares			Award Price
Unvested at December 31, 2021		34,614		$	2.72
Granted		69,228			3.25
Vested		(34,614	)		2.72
Forfeited		—			—
Unvested at June 30, 2022		69,228			3.25
Expected to vest after June 30, 2022		69,228			3.25

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

	June 30, 2022
Stock options outstanding		1,564,160
Restricted stock units and performance stock units outstanding		486,228
Stock options and restricted stock units available for future grant		965,044
Common stock reserved for future issuance		3,015,432