Note 4 - Balance Sheet Detail (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block Supplement [Abstract]

Schedule of Inventory, Current [Table Text Block]

	December 31,
	2014		2013
Raw materials	$	7,185	$	5,989
Finished goods		3,803		3,017
Total	$	10,988	$	9,006

Property, Plant and Equipment [Table Text Block]

	December 31,
	2014			2013
Leasehold improvements	$	641		$	625
Office equipment and furniture		2,964			3,285
Machinery and equipment		4,140			3,876
		7,745			7,786
Less: Accumulated depreciation		(6,284	)		(6,424	)
Property and equipment, net	$	1,461		$	1,362

Schedule of Intangible Assets and Goodwill [Table Text Block]

	Gross Carrying Amount		Accumulated Amortization & Impairment Amount		Net Amount
December 31, 2014
Patent sublicense	$	1,218	$	1,206	$	12
Customer relationship intangible related to acquisition		2,510		1,998		512
Other identified intangible assets related to acquisition		780		780		—
Other intangible		155		84		71
Goodwill		1,339		—		1,339
Total	$	6,002	$	4,068	$	1,934
December 31, 2013
Patent sublicense	$	1,218	$	1,068	$	150
Customer relationship intangible related to acquisition		2,510		962		1,548
Other identified intangible assets related to acquisition		780		607		173
Other intangible		155		6		149
Goodwill		1,339		—		1,339
Total	$	6,002	$	2,643	$	3,359

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Year ending December 31,	Amount
2015	$	452
2016		142
2017		1
Total	$	595

Schedule of Accrued Liabilities [Table Text Block]

	December 31,
	2014		2013
Payroll and related expenses	$	5,533	$	4,753
Sales tax		1,789		1,307
Warranty		1,167		1,202
Other		2,518		2,066
Total	$	11,007	$	9,328