Note 13 - Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Prepaid Expenses and Other Current Assets [Member] \| Designated as Hedging Instrument [Member]
Asset derivatives, fair value	$ (373)	$ 212
Asset derivatives, fair value	373	(212)
Prepaid Expenses and Other Current Assets [Member] \| Not Designated as Hedging Instrument [Member]
Asset derivatives, fair value	(324)	(45)
Asset derivatives, fair value	324	45
Accrued Expenses [Member] \| Designated as Hedging Instrument [Member]
Liability derivatives, fair value	342	377
Accrued Expenses [Member] \| Not Designated as Hedging Instrument [Member]
Liability derivatives, fair value	$ 337	$ 137

Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant