Note 12 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	Performance-based Share Units					Restricted Shares and Restricted Share Units
	Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value
Balance, January 1, 2017		-		$	-		202,021		$	9.90
Granted		126,953			8.98		940,147			9.56
Vested and released		-			-		(299,951	)		9.72
Forfeited		(39,161	)		8.98		(63,945	)		9.41
Balance, December 31, 2017		87,792			8.98		778,272			9.60
Granted		88,851			10.27		217,203			11.12
Vested and released		-			-		(352,116	)		9.67
Forfeited		(13,863	)		8.98		(23,633	)		9.60
Balance, December 31, 2018		162,780			9.63		619,726			10.16
Granted		61,631			15.25		139,168			15.97
Vested and released		-			-		(413,661	)		10.11
Forfeited		(8,990	)		8.98		(3,187	)		11.31
Balance, December 31, 2019		215,421			11.16		342,046			12.47

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, 2017		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
Granted		-			-
Exercised		(20,000	)		11.26
Forfeited		-			-
Options outstanding as of December 31, 2019		200,000			9.47		6.7		1,376,000

	As of December 31, 2019
	Number of Options		Weighted Average Exercise Price		Weighted Average Contractual Live (Years)		Aggregate Intrinsic Value
Options vested and/or expected to vest		200,000	$	9.47		6.7	$	1,376,000
Options exercisable		150,000		9.47		6.7		1,032,000