Note 12 - Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Income from Operations by Geographic Area [Table Text Block]

	Three Months Ended March 31,
(in thousands)	2019			2018
Income from Operations:
United States	$	26,310		$	28,843
Europe		4,221			3,361
Corporate Unallocated and Japan		(11,083	)		(10,476	)
Total Income from Operations	$	19,448		$	21,728

Long-lived Assets by Geographic Areas [Table Text Block]

	March 31,		December 31,
(in thousands)	2019		2018
Total long-lived assets:
United States	$	191,296	$	185,979
Europe		35,465		34,577
Japan		7,450		7,445
Total Assets	$	234,211	$	228,001

Operating Segments [Member]

Notes Tables

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended March 31,
(in thousands)	2019		2018
Revenue:
United States	$	87,811	$	84,167
Europe		21,254		19,945
Japan		4,387		3,633
Total revenue	$	113,452	$	107,745