Note 11 - Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	Year Ended December 31,
	2020			2019
Dividend yield		0	%		0	%
Expected life (in years)		4.9			4.9
Expected volatility		64	%		59	%
Risk-free interest rate		0.5	%		1.6	%

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

	Year Ended December 31,
	2020			2019
Cost of revenue— professional engineering service	$	79		$	1
Selling, general and administrative		735			546
Research and development		(2	)		(28	)
Total share-based compensation expense	$	812		$	519
Per basic share	$	0.06		$	0.04
Per diluted share	$	0.06		$	0.04

Share-based Payment Arrangement, Option, Activity [Table Text Block]

						Weighted Average
						Remaining
				Weighted Average		Contractual Life		Aggregate
	Number of Shares			Exercise Price		(in years)		Intrinsic Value
Balance at December 31, 2018		1,390,012		$	4.77		6.83
Granted		958,798			1.69
Exercised		-			-
Forfeited		(251,213	)		4.81
Expired		(552,771	)		5.07
Balance at December 31, 2019		1,544,826			2.74		7.47	$	46,582
Granted		683,900			1.08
Exercised		(26,250	)		1.34
Forfeited		(215,218	)		1.50
Expired		(200,367	)		4.82
Balance at December 31, 2020		1,786,891			3.10		7.75	$	330,831
Vested and expected to vest at December 31, 2020		1,593,216			2.12		7.63		278,883
Exercisable at December 31, 2020		609,781		$	3.26		6.03	$	19,668

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

	Year Ended December 31,
	2020		2019
Weighted average grant-date fair value for options granted during the year	$	1.08	$	1.33
Vested options in-the-money		71,993		344
Aggregate intrinsic value of options exercised during the year	$	1	$	—

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

	Number of			Weighted Average
	Shares			Award Price
Unvested at December 31, 2018		186,516		$	2.87
Granted		225,693			1.44
Vested		(264,720	)		2.03
Forfeited		(34,643	)		4.68
Unvested at December 31, 2019		112,846			1.44
Granted		219,596			1.48
Vested		(167,745	)		1.45
Forfeited		-			-
Unvested at December 31, 2020		164,697			1.48
Expected to vest after December 31, 2020		158,504		$	1.48

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

Stock options outstanding	1,786,891
Restricted stock units outstanding	164,697
Stock options available for future grant	1,242,125
Common stock reserved for future issuance	3,193,713