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Note 3 - Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

		Net Product Sales				Accounts Receivable
		Three Months March 31, 2019				As of March 31, 2019
Customer A			40.7	%			42.3	%
Customer B			36.6	%			39.2	%
Customer C			20.4	%			17.5	%
Total			97.7	%			99.0	%

Valuation Allowances and Reserves [Table Text Block]

		Product Returns				Distributor Fees				Discounts, Rebates and Administrative Fees				Total
Balance at December 31, 2018		$	947			$	2,813			$	21,743			$	25,503
Provision			332				3,825				30,642				34,799
Payments/credits			(3	)			(3,289	)			(22,945	)			(26,237	)
Balance at March 31, 2019		$	1,276			$	3,349			$	29,440			$	34,065

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

		March 31 ,
		2019				2018
Stock options outstanding			14,281				12,906
Warrants outstanding			640				640
Shares of common stock underlying Convertible Notes outstanding			8,600				8,103

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