Note 6 - Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

	Three Months Ended March 31,
	2022			2021
Dividend yield		0	%		0	%
Expected life (years)		4.9			4.9
Expected volatility		111	%		83	%
Risk-free interest rate		1.8	%		0.4	%

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

	Three Months Ended March 31,
	2022		2021
Cost of revenue — Edge to Cloud	$	6	$	15
Selling, general and administrative		66		146
Research and development		3		7
Total stock-based compensation expense	$	75	$	168

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		50,000			1.84
Exercised		(54,167	)		1.20
Forfeited		(8,125	)		1.02
Expired		(26,625	)		3.45
Balance at March 31, 2022		1,625,097			2.07		6.70		385,088
Vested and expected to vest at March 31, 2022		1,625,097			2.07		6.70		385,088
Exercisable at March 31, 2022		988,838		$	2.38		6.13	$	189,808

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

	Three Months Ended March 31,
	2022		2021
Weighted average grant-date fair value of options granted during the period	$	1.84	$	3.17
Options in-the-money (in shares)		312,661		550,733
Aggregate intrinsic value of options exercised during the period	$	1.20	$	5.15

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		—			—
Vested		(17,307	)		2.72
Forfeited		—			—
Unvested at March 31, 2022		17,307			2.72
Expected to vest after March 31, 2022		17,307		$	2.72

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

	March 31, 2022
Stock options outstanding		1,625,097
Restricted stock units and performance stock units outstanding		433,974
Stock options and restricted stock units available for future grant		1,045,772
Common stock reserved for future issuance		3,104,843