Note 11 - Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	Year Ended					Year Ended
	December 31, 2019					December 31, 2018
				Wtd. Avg.					Wtd. Avg.
				Exercise					Exercise
	Shares			Price		Shares			Price
Outstanding at beginning of year		2,043,402		$	1.91		2,390,012		$	1.85
Granted	––			––		––			––
Exercised		(469,510	)		1.72		(330,983	)		1.36
Forfeited		(3,437	)		5.69		(15,627	)		4.34
Expired - vested	––			––		––			––
Outstanding at end of year		1,570,455		$	1.96		2,043,402		$	1.91
Stock options exercisable at year end		1,465,599		$	1.94		1,661,999		$	1.87

	Year Ended					Year Ended
	December 31, 2019					December 31, 2018
				Wtd. Avg.					Wtd. Avg.
				Exercise					Exercise
	Shares			Price		Shares			Price
Outstanding at beginning of year		964,997		$	1.64		999,997		$	1.64
Granted	––			––		––			––
Exercised		(227,500	)		1.64		(35,000	)		1.64
Outstanding at end of year		737,497		$	1.64		964,997		$	1.64
Stock options exercisable at year end		737,497		$	1.64		465,001		$	1.64

Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

Range of Exercise Prices			Number Outstanding at December 31, 2019		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price
$0.49	-	1.00		3,571		1.91	$	0.49
$1.01	-	1.50		175,199		1.32	$	1.24
$1.51	-	2.50		1,328,367		5.46	$	1.94
$2.51	-	8.60		63,318		5.71	$	4.42
				1,570,455		5.00	$	1.96

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

	Year Ended					Year Ended
	December 31, 2019					December 31, 2018
				Wtd. Avg.					Wtd. Avg.
				Grant Date					Grant Date
	Shares			Fair Value		Shares			Fair Value
Outstanding at beginning of year		279,919		$	5.00		237,926		$	1.79
Granted		309, 218			17.15		181,268			7.02
Vested		(125,818	)		4.57		(116,647	)		1.81
Forfeited		(33,920	)		12.88		(22,628	)		3.95
Non-vested at end of year		429,399		$	13.25		279,919		$	5.00

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

	Year Ended December 31,
(In thousands)	2019		2018
Research and development costs	$	571	$	260
Sales and marketing costs		711		269
General and administrative costs		1,584		809
Cost of product revenue		177		181
Total	$	3,043	$	1,519