Note 15 - Segment and Geographic Information - Summary of Net Revenues, Net Income of Domestic and Foreign Operations (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Net Revenues	$ 83,372	$ 79,484	$ 78,629	$ 80,638	$ 79,772		$ 75,133		$ 80,257		$ 82,047		$ 322,123	$ 317,209	$ 338,767
Net income	$ 9,294	$ 5,100	$ 3,935	$ 3,019	$ 6,197	[1]	$ 2,286	[1]	$ 3,273	[1]	$ 2,985	[1]	21,348	14,741	23,740
Foreign [Member]
Net Revenues													148,159	159,984	188,964
Net income													17,172	11,039	21,379
Domestic [Member]
Net Revenues													173,964	157,225	149,803
Net income													$ 4,176	$ 3,702	$ 2,361

[1] During the fiscal year ended March 31, 2016, we recorded out-of-period adjustments that increased the income tax provision by a net amount of $1.4 million. See Note 16, "Income Taxes" in the Notes to Consolidated Financial Statements in Item 8 of this Annual Report on Form 10-K for further discussion of an out-of-period adjustment during the quarter ended December 31, 2015.