Note 13 - Lease Financing Obligations - Amortization Expense Related to the Design Tools (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Design Tools [Member]
Amortization expense	$ 1,483	$ 941	$ 2,825	$ 2,979

The charge for the use of long-lived depreciable capital leased assets for the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 840
-Section 55
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501752&loc=d3e56872-110439

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45031-112735

Name:	us-gaap_CapitalLeasesIncomeStatementAmortizationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration