Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	Year Ended December 31,
	201 8			201 7		201 6
U.S.	$	(14,177	)	$	11,203	$	2,207
Foreign		662			757		513
Income (loss) before income taxes	$	(13,515	)	$	11,960	$	2,720

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	201 8		201 7		201 6
Current:
Federal	$	(15)	$	148	$	—
State		123		71		16
Foreign		303		511		131
Total Current		411		730		147
Deferred:
Federal		15,674		(17,393)		(24)
State		1,230		(1,348)		(2)
Foreign		(60)		(22)		22
Total Deferred		16,844		(18,763)		(4)
Tax provision	$	17,255	$	(18,033)	$	143

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	201 8		201 7
Net operating loss carryforwards	$	11,227	$	8,604
Stock-based compensation		1,040		1,179
Other accruals and reserves		1,924		1,663
Credits		10,857		11,781
Foreign		457		399
Accrued warranty		1,863		847
Depreciation and amortization		2,024		1,592
Other		282		303
Deferred tax asset before valuation allowance		29,674		26,368
Valuation allowance		(27,865)		(7,242)
Deferred tax asset after valuation allowance		1,809		19,126
Deferred tax liability		(1,269)		—
Deferred tax liability on goodwill		(83)		(71)
Net deferred tax asset	$	457	$	19,055

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	201 8			2017*		2016*
U.S. federal statutory income tax rate		21.00	%	34.00	%	34.00	%
State tax rate		(4.95)		(5.59)		(14.56)
Meals and entertainment		(2.66)		2.15		7.56
Stock-based compensation		13.66		(21.55)		14.36
SAB 118 Change in Estimate		(2.43)		—
Foreign rate differential		0.11		(0.50)		(0.16)
Other		(1.21)		0.65		(2.15)
General business credit		4.31		(2.72)		(9.25)
Change in Federal Tax Rate		—		60.98		—
Valuation allowance		(155.49)		(218.17)		(24.57)
Effective tax rate		(127.66)	%	(150.75)	%	5.23	%

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	Year Ended December 31,
	201 8		201 7		201 6
Balance at beginning of year	$	1,519	$	707	$	651
Decreases related to prior year tax positions		(70)		643		—
Increases related to current year tax positions		114		169		56
Balance at end of year	$	1,563	$	1,519	$	707