Note 11 - Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

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 December 31, 2020		3,931,586		$	4.41		4.80
Granted		982,500		$	5.57
Exercised		(915,404	)	$	1.83
Forfeited, cancelled, expired		(319,799	)	$	5.12
Outstanding September 30, 2021		3,678,883		$	5.30		5.47	$	4,335
Exercisable September 30, 2021		1,904,711		$	4.37		3.01	$	3,493

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

	For the Nine Months
	Ended September 30,
	2021			2020
Expected stock price volatility		50	%		46	%
Risk-free interest rate		0.90	%		0.38	%
Forfeiture rate		0	%		0	%
Expected dividend yield		0	%		0	%
Expected life of options - years		5.74			6.15
Weighted-average fair value of options granted	$	2.57		$	3.43

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

				Weighted Average		Weighted Average
	Service-Based			Grant Date		Vesting
	RSU's			Fair Value		Period (in Years)
Unvested at December 31, 2020		428,006		$	6.13
Granted - service based		352,890		$	5.72
Vested		(421,407	)	$	5.63
Forfeited and cancelled		(32,874	)	$	6.10
Unvested at September 30, 2021		326,615		$	6.34	2.1

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Selling, general and administrative	$	1,093	$	468	$	3,722	$	1,393
Research and development		210		78		588		169
Total share-based expense	$	1,303	$	546	$	4,310	$	1,562