Note 5 - Stock-based Compensation - Non-vested Stock to Directors (Details) - Non Employee Directors [Member]	3 Months Ended
Jul. 02, 2017 $ / shares shares
August 10, 2016 [Member]
Number of Shares (in shares) \| shares	28,000
Fair Value Per Share (in dollars per share) \| $ / shares	$ 10.08
August 12, 2015 [Member]
Number of Shares (in shares) \| shares	28,000
Fair Value Per Share (in dollars per share) \| $ / shares	$ 8.20
August 11, 2014 [Member]
Number of Shares (in shares) \| shares	28,000
Fair Value Per Share (in dollars per share) \| $ / shares	$ 7.97

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration