Note 4 - Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2013

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

	September 30, 2013		December 31, 2012
Deferred revenue and customer prepayments	$	2,736	$	2,198
Stock rotation reserve		1,851		961
Sales rebate		1,480		575
Commissions		629		464
Legal expenses and settlement costs		565		402
Warranty		383		331
Other		1,601		984
Total accrued liabilities	$	9,245	$	5,915

Schedule of Product Warranty Liability [Table Text Block]

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Balance at beginning of period	$	334		$	443		$	331		$	561
Warranty provision for product sales		130			583			349			802
Settlements made		(3	)		(29	)		(98	)		(154	)
Unused warranty provision		(78	)		(138	)		(199	)		(350	)
Balance at end of period	$	383		$	859		$	383		$	859