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Note 5 - Stockholders' Equity (Details Textual) - USD ($)	9 Months Ended
	Dec. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Treasury Stock, Shares	2,414,678
Treasury Stock, Value	$ 69,941,000	$ 66,499,000	$ 67,550,000
Common Class A [Member]
Treasury Stock, Shares, Acquired	114,532
Treasury Stock, Value, Acquired, Cost Method	$ 3,441,000

X

- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29,30)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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