Note 7 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

	Three Months Ended
	March 31, 2021
	Shares			Wtd. Avg. Exercise Price
Outstanding at beginning of year		844,455		$	2.00
Exercised		(85,555	)		1.37
Forfeited		(1,146	)		5.69
Expired		(35,714	)		1.73
Outstanding at March 31, 2021		722,040		$	2.09
Stock options exercisable at March 31, 2021		716,936		$	2.07

	Three Months Ended
	March 31, 2021
	Shares			Wtd. Avg. Exercise Price
Outstanding at beginning of year		686,001		$	1.64
Exercised		(77,310	)		1.64
Outstanding at March 31, 2021		608,691		$	1.64
Stock options exercisable at March 31, 2021		608,691			1.64

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

	Three Months Ended
	March 31, 2021
	Shares			Wtd. Avg. Grant Date Fair Value
Outstanding at beginning of year		930,854		$	19.31
Granted		52,616			41.98
Vested		(68,365	)		10.07
Forfeited		(4,941	)		23.94
Non-vested at March 31, 2021		910,164		$	21.29

	Three Months Ended
	March 31, 2021
	Shares			Wtd. Avg. Grant Date Fair Value
Outstanding at beginning of year		224,774		$	19.20
Granted		146,250			32.14
Vested		(231,268	)		26.98
Non-vested at March 31, 2021		139,756		$	21.29

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

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Research and development costs	$	183	$	174
Sales and marketing costs		184		229
General and administrative costs		979		577
Cost of revenue		159		133
Total	$	1,505	$	1,113