Note 12 - Summary of Stock Options (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	Nine Months Ended September 30, 2022
						Weighted
				Weighted		Average
	Number			Average		Remaining		Aggregate
	of			Exercise		Contractual		Intrinsic
	Shares			Price		Term (years)		Value
Options outstanding, January 1, 2022		3,173,103		$	7.51		9.0	$	-
Options granted		959,000		$	1.25
Options exercised		-
Options canceled		(26,397	)	$	8.02
Options outstanding, September 30, 2022		4,105,706		$	6.05		8.5	$	80
Vested and exercisable and expected to vest, September 30, 2022		3,895,519		$	6.24		8.5	$	71
Vested and exercisable, September 30, 2022		1,521,946		$	11.45		8.1	$	-

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

							Weighted
			Number		Weighted		Average		Number		Weighted
			Outstanding		Average		Remaining		Exercisable		Average
Range of			as of		Exercise		Contractual		as of		Exercise
Exercise Prices			September 30, 2022		Price		Term (Years)		September 30, 2022		Price
$0.66	-	$1.26		953,167	$	1.25		9.3		157,712	$	1.26
$2.28	-	$2.96		2,196,021	$	2.73		8.7		688,362	$	2.73
$3.06	-	$3.40		10,000	$	3.20		8.5		3,771	$	3.20
$4.45	-	$4.80		11,900	$	4.72		8.2		5,319	$	4.71
$5.10	-	$5.40		88,000	$	5.28		8.0		63,250	$	5.34
$6.90	-	$6.90		5,400	$	6.90		7.5		3,376	$	6.90
$8.60	-	$8.91		822,332	$	8.69		7.1		583,220	$	8.69
$10.90	-	$13.60		15,500	$	12.64		7.4		13,553	$	12.89
$380.00	-	$9,920.00		3,386	$	2,869.31		5.5		3,383	$	2,870.91
Total:				4,105,706	$	6.05		8.5		1,521,946	$	11.45

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

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022			2021			2022			2021
Expected term (in years)		6			5			6			6
Average volatility		89	%		84	%		88	%		76	%
Risk-free interest rate		2.69	%		0.81	%		1.46	%		0.97	%
Dividend yield		0	%		0	%		0	%		0	%

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Cost of revenue	$	64	$	76	$	193	$	191
Research and development		118		131		361		330
Selling, general and administrative		686		881		2,183		2,244
Total	$	868	$	1,088	$	2,737	$	2,765