Note 1 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended
	March 31,
Source	2019		2018
Royalty income	$	4,161	$	3,058
Other revenue		120		131
Total revenue	$	4,281	$	3,189

Property, Plant and Equipment [Table Text Block]

	March 31,			December 31,
	2019			2018
Machinery and equipment	$	3,887		$	2,992
Leasehold improvements		3,034			1,734
Computer equipment		621			721
Furniture and fixtures		878			878
Construction in progress		455			317
Property and equipment, gross		8,875			6,642
Less - accumulated depreciation		(2,813	)		(2,698	)
Property and equipment, net	$	6,062		$	3,944