Note 9 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023		5,491,399		$	3.72		5.96	$	92
Granted		-		$	0
Exercised		(250	)	$	1.50
Forfeited, cancelled, expired		(1,300,287	)	$	5.33
Outstanding March 31, 2023		4,190,862		$	3.15		7.49	$	98
Exercisable March 31, 2023		1,299,771		$	3.74		4.11	$	96

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

	For the Three Months
	Ended March 31,
	2023			2022
Expected stock price volatility		0	%		49	%
Risk-free interest rate		0	%		1.57	%
Expected dividend yield		0	%		0	%
Expected life of options - years		0			1.39
Weighted-average fair value of options granted	$	0		$	1.72

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, 2023		922,057		$	2.88		2.11
Granted - service based		124,862		$	1.84
Vested		(106,565	)	$	2.87
Forfeited and cancelled		(3,386	)	$	5.52
Unvested at March 31, 2023		936,968		$	2.56		1.99

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

	Three Months Ended March 31,
	2023		2022
Selling, general and administrative	$	562	$	894
Research and development		66		135
Total share-based expense	$	628	$	1,029