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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended	45 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Lease, Right-of-Use Asset	$ 2,547		$ 2,547	$ 2,547	$ 2,966
Operating Lease, Liability, Total	2,685		2,685	2,685	3,101
Deferred Rent Credit					$ 135
Cash and Cash Equivalents, at Carrying Value, Ending Balance	2,010	$ 2,522	2,010	2,010		$ 11,211	$ 5,571
Working Capital (Deficit)	22,470		22,470	22,470
Net Cash Provided by (Used in) Operating Activities, Total	$ (6,570)	$ (3,581)
Increase (Decrease) in Net Cash Provided by (Used in) Operating Activities			$ 2,989
Litigation for Intellectual Property Infringement [Member]
Litigation Settlement, Expense				$ 11,877

X

- Definition

Amount of increase (decrease) in the amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of a company's current assets minus the amount of its current liabilities.

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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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