Note 13 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Share-based Compensation Arrangements by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Balance, January 1, 2017		-		$	-
Granted		126,953			8.98
Vested and released		-			-
Forfeited		(39,161	)		8.98
Balance, December 31, 2017		87,792			8.98
Granted		88,851			10.27
Vested and released		-			-
Forfeited		(13,863	)		8.98
Balance, December 31, 2018		162,780			9.63

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Balance, January 1, 2016		-		$	-
Granted		213,812			9.97
Vested and released		(11,791	)		11.20
Forfeited		-			-
Balance, December 31, 2016		202,021			9.90
Granted		940,147			9.56
Vested and released		(299,951	)		9.72
Forfeited		(63,945	)		9.41
Balance, December 31, 2017		778,272			9.60
Granted		217,203			11.12
Vested and released		(352,116	)		9.67
Forfeited		(23,633	)		9.60
Balance, December 31, 2018		619,726			10.16

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

	2016 Grants
Stock price	$	9.63
Exercise price	$	9.63
Dividend yield		0.00	%
Expected volatility		60.00	%
Risk-free interest rate		1.18	%
Expected term in years		5.11

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]

	Number of Options			Weighted Average Exercise Price		Weighted Average Contractual Live (Years)		Aggregate Intrinsic Value
Options outstanding as of January 1, 2016		2,849,071		$	2.69		3.7	$	23,992,814
Granted		220,000			9.63
Exercised		(638,223	)		1.76
Forfeited		(300,000	)		10.58
Options outstanding as of December 31, 2016		2,130,848			2.57		2.8		146,542,221
Granted		-			-
Exercised		(955,424	)		1.76
Forfeited		-			-
Options outstanding as of December 31, 2017		1,175,424			3.23		2.4		7,707,255
Granted		-			-
Exercised		(955,424	)		1.76
Forfeited		-			-
Options outstanding as of December 31, 2018		220,000			9.63		7.6		842,000

	As of December 31, 2018
	Number of Options		Weighted Average Exercise Price		Weighted Average Contractual Live (Years)		Aggregate Intrinsic Value
Options vested and/or expected to vest		220,000	$	9.63		7.6	$	842,000
Options exercisable		113,333		9.68		7.6		428,333