Note 6 - Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2022

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,
	2022			2021			2022			2021
Dividend yield		0	%		0	%		0	%		0	%
Expected life (years)		4.9			4.9			4.9			4.9
Expected volatility		110	%		111	%		110	%		111	%
Risk-free interest rate		3.3	%		0.6	%		2.7	%		0.6	%

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Cost of revenue — Edge to Cloud	$	4	$	6	$	13	$	30
Selling, general and administrative		178		188		279		515
Research and development		2		24		6		51
Total stock-based compensation expense	$	184	$	218	$	298	$	596

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, 2021		1,664,014		$	2.07		6.64	$	405,223
Granted		91,500			1.66
Exercised		(67,500	)		1.16
Forfeited		(65,604	)		1.77
Expired		(63,213	)		3.29
Balance at September 30, 2022		1,559,197			2.05		6.42		51,822
Vested and expected to vest at September 30, 2022		1,524,158			2.06		6.38		50,527
Exercisable at September 30, 2022		1,097,797			2.26		5.85		31,799

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Weighted average grant-date fair value of options granted during the period	$	1.40	$	2.75	$	1.66	$	2.88
Options in-the-money (in shares)		222,373		629,272		222,373		629,272
Aggregate intrinsic value of options exercised during the period	$	1.02	$	1.20	$	1.16	$	1.88

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		83,221			3.25
Vested		(51,921	)		2.90
Forfeited		—			—
Unvested at September 30, 2022		65,914			3.25
Expected to vest after September 30, 2022		65,914			3.25

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

	September 30, 2022
Stock options outstanding		1,559,197
Restricted stock units and performance stock units outstanding		482,914
Stock options and restricted stock units available for future grant		926,051
Common stock reserved for future issuance		2,968,162