Note 12 - Summary of Stock Options (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

	Six Months Ended June 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		955,000		$	1.25
Options exercised		-
Options canceled		(4,094	)	$	7.69
Options outstanding, June 30, 2022		4,124,009		$	6.06		8.8	$	-
Vested and exercisable and expected to vest, June 30, 2022		3,873,550		$	6.29		8.8	$	-
Vested and exercisable, June 30, 2022		1,266,335		$	13.10		8.3	$	-

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			June 30, 2022		Price		Term (Years)		June 30, 2022		Price
$0.71	-	$1.26		955,000	$	1.25		9.5		98,024	$	1.26
$2.28	-	$2.96		2,207,000	$	2.73		9.0		544,316	$	2.73
$3.06	-	$3.40		10,000	$	3.20		8.7		3,146	$	3.20
$4.45	-	$4.80		11,900	$	4.72		8.4		4,576	$	4.71
$5.10	-	$5.40		88,000	$	5.28		8.3		62,907	$	5.34
$6.90	-	$6.90		5,400	$	6.90		7.8		3,038	$	6.90
$8.60	-	$8.91		827,800	$	8.69		7.4		533,718	$	8.69
$10.90	-	$13.60		15,500	$	12.64		7.7		13,209	$	12.94
$380.00	-	$9,920.00		3,409	$	2,878.01		5.8		3,401	$	2,882.61
Total:				4,124,009	$	6.06		8.8		1,266,335	$	13.10

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2022			2021			2022			2021
Expected term (in years)		6			6			6			6
Average volatility		89	%		83	%		88	%		83	%
Risk-free interest rate		2.94	%		0.98	%		1.45	%		0.98	%
Dividend yield		0	%		0	%		0	%		0	%

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2022		2021		2022		2021
Cost of revenue	$	64	$	60	$	129	$	115
Research and development		120		102		243		200
Selling, general and administrative		725		705		1,497		1,362
Total	$	909	$	867	$	1,869	$	1,677