Note 12 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

ESPP	479,000
Equity awards	801,000
Undesignated preferred stock	5,000,000
	6,280,000

Share-based Compensation, Activity [Table Text Block]

	Year ended December 31,
	201 8							201 7							201 6
	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		1,992		$	5.02	$	-		2,152		$	5.12	$	-		3,740		$	6.22	$	-
Changes during the year:
Options granted		54		$	12.42	$	-		78		$	11.93	$	-		64		$	9.44	$	-
SARs granted		13		$	12.50	$	-		190		$	10.40	$	-
RSUs granted		563		$	-	$	-		476		$	-	$	-		573		$	-	$	-
Exercised (4)		(723	)	$	2.81	$	6,845		(818	)	$	3.77	$	6,699		(1,905	)	$	5.55	$	10,344
Forfeited and cancelled		(68	)	$	5.63	$	-		(86	)	$	9.85	$	-		(320	)	$	7.16	$	-
Options/SARs/RSUs outstanding at end of year (1,2,4)		1,831		$	4.59	$	12,281		1,992		$	5.02	$	14,931		2,152		$	5.12	$	17,347
Options/SARs/RSUs exercisable at end of year (1,3,4)		704		$	9.10	$	1,576		813		$	8.20	$	3,499		1,132		$	8.27	$	5,703

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by 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)			946		-		-		-		-		-
5.21	-	7.26		157		2.21		5.94		157		2.21		5.94
7.49	-	9.71		276		4.05		8.82		276		4.05		8.82
10.15	-	15.79		452		5.39		11.16		271		4.90		11.22
				1,831		4.41		4.59		704		3.97		9.10

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

	Year ended December 31,
	201 8			2017			2016
Volatility		45.91	%		37.47	%		46.02	%
Risk-free interest rate		2.55	%		2.23	%		2.29	%
Dividend yield		0	%		0	%		0	%
Pre-vest cancellation rate *)		2.68	%		4.06	%		1.87	%
Post-vest cancellation rate **)		3.34	%		3.45	%		3.44	%
Suboptimal exercise factor ***)		1.49			1.31			1.69
Expected life		5.92			4.22			5.50

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, 2017		1,179			7.50
Granted		630			10.52
Vested		(627	)		7.54
Forfeited		(55	)		9.10
Non-vested at December 31, 2018		1,127			9.09