Note 10 - Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

				Weighted Average
	Options on					Remaining		Aggregate
	Common			Exercise		Contractual		Intrinsic
	Shares			Price		Term		Value
Outstanding January 1, 2022		3,935,883		$	5.24		4.79
Granted		2,734,639		$	2.85
Exercised		(55,500	)	$	1.50
Forfeited, cancelled, expired		(978,709	)	$	5.48
Outstanding September 30, 2022		5,636,313		$	3.74		6.01	$	232,778
Exercisable September 30, 2022		2,507,744		$	4.47		2.14	$	232,778

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

	For the Nine months
	Ended September 30,
	2022			2021
Expected stock price volatility		49	%		50	%
Risk-free interest rate		1.17	%		0.90	%
Expected dividend yield		0	%		0	%
Expected life of options - years		3.46			5.74
Weighted-average fair value of options granted	$	1.25		$	2.57

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

				Weighted Average		Weighted Average
	Service-Based			Grant Date		Vesting
	RSU's			Fair Value		Period (Years)
Unvested at January 1, 2022		269,303		$	6.47
Granted - service based		753,817		$	2.57
Vested		(218,133	)	$	4.93
Forfeited and cancelled		(60,023	)	$	6.57
Unvested at September 30, 2022		744,964		$	2.97		2.32

Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

	Three Months Ended September 30,				Nine months Ended September 30,
	2022		2021		2022		2021
Selling, general and administrative	$	700	$	1,093	$	2,180	$	3,722
Research and development		172		210		448		588
Total share-based expense	$	872	$	1,303	$	2,628	$	4,310