Note 13 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Equity Based Awards Available for Future Issuance [Table Text Block]

ESPP	273,000
Equity awards	1,736,000
Undesignated preferred stock	5,000,000
	7,009,000

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

	Year ended December 31,
	201 9							201 8							201 7
	Amount of options/ SARs/RSUs			Weighted average exercise price		Aggregate intrinsic value (4)		Amount of options/ SARs/RSUs			Weighted average exercise price		Aggregate intrinsic value (4)		Amount of options/ SARs/RSUs			Weighted average exercise price		Aggregate intrinsic value (4)
	in thousands							in thousands							in thousands
Options outstanding at beginning of year		1,831		$	4.59	$	-		1,992		$	5.02	$	-		2,152		$	5.12	$	-
Changes during the year:
Options granted		10		$	12.61	$	-		54		$	12.42	$	-		78		$	11.93	$	-
SARs granted		-		$	-	$	-		13		$	12.50	$	-		190		$	10.40	$	-
RSUs granted		656		$	-	$	-		563		$	-	$	-		476		$	-	$	-
Exercised (4)		(663	)	$	2.59	$	7,519		(723	)	$	2.81	$	6,845		(818	)	$	3.77	$	6,699
Forfeited and cancelled		(99	)	$	1.59	$	-		(68	)	$	5.63	$	-		(86	)	$	9.85	$	-
Options/SARs/RSUs outstanding at end of year (1,2,4)		1,735		$	3.84	$	20,639		1,831		$	4.59	$	12,281		1,992		$	5.02	$	14,931
Options/SARs exercisable at end of year (1,3,4)		604		$	9.75	$	3,619		704		$	9.10	$	1,576		813		$	8.20	$	3,499

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

Range of exercise price			Outstanding		Remaining contractual life (years) (1 )		Weighted average exercise price		Exercisable		Remaining contractual life (years)		Weighted average exercise price
$			thousands				$		thousands				$
0 (RSUs)				1,059		-		-		-		-		-
5.21	-	7.26		75		2.55		5.74		75		2.55		5.74
7.49	-	9.71		225		3.48		8.89		225		3.48		8.89
10.15	-	15.79		376		4.68		11.27		304		4.73		11.37
				1,735		4.04		3.84		604		3.99		9.75

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

	Year ended December 31,
	201 9			2018			2017
Volatility		32.29	%		45.91	%		37.47	%
Risk-free interest rate		2.16	%		2.55	%		2.23	%
Dividend yield		0	%		0	%		0	%
Pre-vest cancellation rate *)		4.63	%		2.68	%		4.06	%
Post-vest cancellation rate **)		2.28	%		3.34	%		3.45	%
Suboptimal exercise factor ***)		1.229			1.49			1.31
Expected life (in years)		4.92			5.92			4.22

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Non-vested	Units			Weighted average grant date fair value
	(In thousands)			$
Non-vested at December 31, 2018		1,127			9.09
Granted		666			12.44
Vested		(562	)		9.07
Forfeited		(100	)		9.60
Non-vested at December 31, 2019		1,131			11.03