Note 8 - Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	Year Ended December 31,
	201 8		201 7		201 6
Numerator:
Net Income(loss)	$	(30,770)	$	29,993	$	2,577
Denominator:
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic		13,771		13,873		13,225
Dilutive effect of incremental shares and share equivalents		—		855		528
Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted		13,771		14,728		13,753
Net income(loss) per share:
Net income (loss) per share, basic	$	(2.23)	$	2.16	$	0.19
Net income (loss) per share, diluted	$	(2.23)	$	2.04	$	0.19

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

	Year Ended December 31,
	201 8		201 7		201 6
Options to purchase common stock		664		42		220
Restricted stock units		432		9		24
Employee stock purchase plan shares		133		—		—
Performance stock units		43		—		—
Total		1,272		51		244