Note M - Stockholders' Equity (Details Textual) - USD ($)			3 Months Ended		12 Months Ended	189 Months Ended
	Mar. 27, 2015	Mar. 10, 2015	Jun. 25, 2017	Jun. 26, 2016	Mar. 31, 2019	Jun. 25, 2017	Sep. 09, 2016	Jun. 05, 2013
Payments of Ordinary Dividends, Common Stock			$ 125,000	$ 125,000
Minimum Percentage of Common Stock Acquired by a Person or Group which Triggers Exercise of New Rights								15.00%
New Right Purchase Price								$ 100
Common Stock, Capital Shares Reserved for Future Issuance			6,918,971			6,918,971		10,188,600
Treasury Stock, Value, Acquired, Cost Method						$ 77,303,000
Treasury Stock, Shares, Acquired			0			5,127,373
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased			260,258			260,258
MSI Agreement [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased							100,000
Stock Repurchase Program, Share Authorized, Price Per Share							$ 0.01
Special Cash Dividend [Member]
Common Stock, Dividends, Per Share, Declared	$ 25	$ 25
Dividends Payable	$ 1,000,000
Payments of Ordinary Dividends, Common Stock	$ 115,100,000		$ 875,000
Special Cash Dividend [Member] | Scenario, Forecast [Member]
Payments of Ordinary Dividends, Common Stock					$ 125,000