Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Disaggregation of Revenue [Table Text Block]

Source	2018		2017		2016
Royalty income	$	14,908	$	10,965	$	10,295
Other revenue		714		733		59,134
Total revenue	$	15,622	$	11,698	$	69,429

Schedule of Estimated Useful Lives of Fixed Assets [Table Text Block]

Computer equipment (in years)		3
Machinery and equipment (in years)	5	-	7
Furniture and fixtures (in years)		5
Leasehold improvements	Earlier of life of improvement or lease

Deferred Lease [Table Text Block]

	2018		2017
Other current liabilities:
Deferred lease incentive	$	26	$	26
Other liabilities:
Deferred lease liability	$	1,541	$	1,225
Deferred lease incentive	$	277	$	303