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Note 6 - Stockholders' Equity (Details Textual) - USD ($)	9 Months Ended
	Dec. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Treasury Stock, Shares, Ending Balance	2,414,678
Treasury Stock, Value, Ending Balance	$ 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.

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

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