Note 8 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

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

	Six Months Ended
	June 30, 2021
	Shares			Wtd. Avg. Exercise Price
Outstanding as of beginning of year		844,455		$	2.00
Exercised		(100,269	)		1.36
Forfeited		(1,146	)		5.69
Expired		(35,714	)		1.73
Outstanding as of June 30, 2021		707,326		$	2.09
Stock options exercisable as of June 30, 2021		703,787		$	2.09

	Six Months Ended
	June 30, 2021
	Shares			Wtd. Avg. Exercise Price
Outstanding as of beginning of year		686,001		$	1.64
Exercised		(287,490	)		1.64
Outstanding as of June 30, 2021		398,511		$	1.64
Stock options exercisable as of June 30, 2021		398,511			1.64

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	Six Months Ended
	June 30, 2021
	Shares			Wtd. Avg. Grant Date Fair Value
Outstanding as of beginning of year		930,854		$	19.31
Granted		122,166			37.98
Vested		(133,527	)		12.28
Forfeited		(31,199	)		20.44
Non-vested as of June 30, 2021		888,294		$	22.90

	Six Months Ended
	June 30, 2021
	Shares			Wtd. Avg. Grant Date Fair Value
Outstanding as of beginning of year		224,774		$	19.20
Granted		152,665			30.85
Vested		(231,268	)		26.98
Non-vested as of June 30, 2021		146,171		$	20.78

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
Research and development costs	$	437	$	222	$	620	$	397
Sales and marketing costs		269		96		453		325
General and administrative costs		1,667		699		2,646		1,275
Cost of revenue		147		128		305		261
Total	$	2,520	$	1,145	$	4,024	$	2,258