Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Mar. 31, 2017

Notes Tables

Quarterly Financial Information [Table Text Block]

	Three Months Ended
	March 31, 2017		December 31, 2016		September 30, 2016		June 30, 2016
Net revenues	$	83,372	$	79,484	$	78,629	$	80,638
Gross profit		29,194		26,939		25,455		23,994
Operating income		9,233		7,819		6,771		5,029
Net income	$	9,294	$	5,100	$	3,935	$	3,019
Net income per share:
Basic (1)	$	0.29	$	0.16	$	0.12	$	0.10
Diluted (1)	$	0.28	$	0.16	$	0.12	$	0.09
Weighted average shares used in per share calculation:
Basic		31,724		31,558		31,490		31,401
Diluted		32,635		32,209		32,145		32,001

	Three Months Ended
	March 31, 2016		December 31, 2015		September 30, 2015		June 30, 2015
Net revenues	$	79,772	$	75,133	$	80,257	$	82,047
Gross profit		24,115		24,029		26,012		25,602
Operating income		6,834		6,262		7,033		5,704
Net income (2)	$	6,197	$	2,286	$	3,273	$	2,985
Net income per share:
Basic (1)	$	0.20	$	0.07	$	0.10	$	0.09
Diluted (1)	$	0.19	$	0.07	$	0.10	$	0.09
Weighted average shares used in per share calculation:
Basic		31,441		31,487		31,651		31,746
Diluted		32,076		32,343		32,380		32,733