Note 2 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

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

	201 8				201 7
Dividend yield (1)			0.0%				0.0%
Expected volatility			28.22%	(2)	45.50%	to	50.09%	(3)
Risk-free interest rate (4)	2.35%	to	2.91%		1.89%	to	2.26%
Expected life (in years) (5 )			6.25		5.5	to	7.0
Assumed forfeiture rate (6 )			4.0%				6.0%

Share-based Compensation, Activity [Table Text Block]

	201 8		201 7
Stock based compensation expense recognized	$	1,052,000	$	817,000
Number of unvested stock options		1,968,663		1,691,102
Fair value of unvested stock options	$	5,555,672	$	4,596,379
Amount remaining to be recognized as expense	$	4,387,864	$	3,453,675

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Net income (basic and diluted)	$	2,371	$	2,059	$	4,148	$	3,846
Weighted average shares outstanding		58,746		56,945		57,927		56,885
Net income per share – basic	$	0.04	$	0.04	$	0.07	$	0.07
Weighted average shares outstanding (including dilutive CSEs)		59,911		58,301		59,147		58,165
Net income per share – diluted	$	0.04	$	0.04	$	0.07	$	0.07

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

(in thousands)	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Anti-dilutive securities
Share based compensation awards		2,721		1,688		2,666		1,764
Convertible securities		-		1,625		-		1,625
Total anti-dilutive securities		2,721		3,313		2,666		3,389