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Note 7 - Stockholders' Equity (Details Textual) - USD ($)	6 Months Ended
	Sep. 29, 2018	Mar. 31, 2018	Sep. 30, 2017
Treasury Stock, Shares, Ending Balance	2,460,963
Treasury Stock, Value, Ending Balance	$ 71,135,000	$ 69,556,000	$ 69,195,000
Common Class A [Member]
Treasury Stock, Value, Acquired, Cost Method	$ 51,867

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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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.

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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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