Note 8 - Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	Year Ended December 31,
	201 9		201 8		201 7
Numerator:
Net income (loss) (in thousands)	$	(12,348)	$	(30,770)	$	29,993
Denominator:
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic		14,096		13,771		13,873
Dilutive effect of incremental shares and share equivalents		-		-		855
Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted		14,096		13,771		14,728
Net loss per share :
Net income (loss) per share, basic	$	(0.88)	$	(2.23)	$	2.16
Net income (loss) per share, diluted	$	(0.88)	$	(2.23)	$	2.04

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

	Year Ended December 31,
	201 9		201 8		201 7
Options to purchase common stock		417		664		42
Restricted stock units		559		432		9
Employee stock purchase plan shares		111		133		-
Performance stock units		178		43		-
Total		1,265		1,272		51