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Note 3 - Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Available-for-sale Securities [Table Text Block]

		September 30, 2017
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
United States commercial paper		$	4,493			$	—			$	—			$	4,493
Foreign commercial paper			3,999				—				—				3,999
Total		$	8,492			$	—			$	—			$	8,492

		December 31, 2016
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
United States corporate debt		$	12,048			$	—			$	(9	)		$	12,039
Foreign corporate debt			14,065				—				(8	)			14,057
United States commercial paper			8,635				—				—				8,635
Foreign commercial paper			2,993				—				—				2,993
Total		$	37,741			$	—			$	(17	)		$	37,724

Valuation Allowances and Reserves [Table Text Block]

		Product Returns				Distributor Fees				GPO Fees, Rebates and Chargebacks				Total
Balance at December 31, 2016		$	49			$	72			$	221			$	342
Provision			291				1,328				10,049				11,668
Payments/credits			(1	)			(816	)			(5,005	)			(5,822	)
Balance at September 30, 2017		$	339			$	584			$	5,265			$	6,188

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

		As of September 30 ,
		2017				2016
Stock options outstanding			11,198				8,517
Warrants outstanding			620				600
Shares of c ommon stock underlying Convertible Notes outstanding			7,865				7,410

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- Definition

Tabular disclosure of a schedule of allowance and reserve accounts where the valuation and qualifying accounts are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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