Note L - Share-based Compensation - Transactions With Respect to Restricted Stock (Details)	3 Months Ended
	Jun. 25, 2017 $ / shares shares
Unvested restricted stock, beginning balance (in shares) | shares	10,000
Unvested restricted stock, weighted average grant date fair value per share, beginning balance (in dollars per share) | $ / shares	$ 49.80
Vested (in shares) | shares	(5,000)
Vested, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 49.80
Unvested restricted stock, weighted average grant date fair value per share, ending balance (in dollars per share) | $ / shares	$ 49.80
Unvested restricted stock, ending balance (in shares) | shares	5,000